Dr James Hambleton
Honorary Senior Lecturer
School of Engineering (Civil Engineering)
- Email:james.hambleton@newcastle.edu.au
- Phone:(02) 4921 5893
Hitting the ground running
Giving roughly equal weight to experimental and theoretical aspects of geomechanics, Dr Jim Hambleton is digging deep to amplify knowledge about the natural world.
Dr Jim Hambleton is a self-described "dirt man." Sunnily asserting his intrigue and the importance of some of our planet's most mundane materials – earth and stone - the early career researcher boasts it's a challenging but "very fascinating" professional setting he finds himself in.
"I started out wanting to be a structural engineer because working with major buildings sounded really cool," he laughs.
"By the end of my undergraduate degree, however, I was convinced geomechanics was the way to go."
"Soil and rocks are much more puzzling."
"We still don't know how they behave – composites like steel and concrete are created by us to act a certain way."
Faithful to these origins, Jim studies elements of both natural and manmade environments. Whether the application is construction or mining, tribology, or even terrestrial exploration, the North American native avows it's essential to understand our effects as geomorphic agents.
"It turns out, probably unsurprisingly, that human beings move an enormous amount of earth each year," he explains.
"We continue to do so without really acknowledging or grasping what it is we're actually doing."
"Fully understanding these processes poses a tremendous challenge, particularly when you consider the confluence of potentially three-dimensional deformation, contact interaction, material instabilities and rate effects."
Best known for his expertise in computational plasticity, Jim is also well versed in modelling problems in geo and solid mechanics.
"When you put bridges and roads on the Earth you need to know how much they will penetrate under loading, even under their own self weight, and how much they are going to settle over time," he clarifies.
"More dramatically, you have to make sure that they're not going to fail, which we see quite often unfortunately with landslides, tunnel collapses and sink holes."
Tackling grit with grit
Jim's experience in dealing with these complications can be traced back to his PhD thesis. An ambitious postgraduate student at the University of Minnesota in the United States, he looked to examine soil-wheel interactions between 2007 and 2010.
"There are all kinds of reasons why you would be interested in this," the International Association of Computational Mechanics member suggests.
"It encompasses mobility difficulties, for example, whether they are off-road machinery here on Earth or rovers on Martian landscapes."
"Getting unstuck is a really tricky problem!"
"My doctoral work has ramifications for several environmental issues too – the destruction of vegetation, changes in runoff, and erosion all start with wheels damaging the soil."
Seeking to put science behind some "very empirical" data, Jim set about developing rigorous modelling framework for this specialist research area. Morphing into "something quite fundamental," the impressive innovator's three-year probe duly served to document the process by which plastic deformation is induced in different terrains.
"It produced a handful of offshoots," he recalls.
"I conducted subsequent studies on wheels themselves, for example."
Down to earth
Jim relocated to Australia after receiving his PhD, signing on to become a postdoctoral research associate with the University of Newcastle's Centre for Geotechnical and Materials Modelling. Teaming up with academics from the University of Western Australia and University of Wollongong a year later, the passionate scholar switched over to the Australian Research Council's Centre of Excellence for Geotechnical Science and Engineering.
"It was an absolute blessing," he states.
"It's brought together a really wonderful, smart group of people."
Continuing to collaborate with some of the field's boldest and brightest, Jim is currently investigating the mechanics of installation for screw piles and screw-type devices.
"The former are deep foundations that consist of one or more helical plates mounted to a central shaft," he comments.
"They're installed by twisting the pile into the ground under an applied torque or axial force."
"The latter, on the other hand, are encountered in a large number of applications, ranging from the fasteners used in building construction to the biomedical screws used to secure bone and other tissue."
With "relatively few attempts" made to model these processes theoretically, Jim is looking to champion multidisciplinary research about the fundamentals of ground anchoring systems.
"We're in a period of infancy in terms of understanding how they actually work," he admits.
"They're easy to install, but, depending on the load combination, can under-rotate, neutrally rotate, or over-rotate, which in turn affects the amount of soil disturbance."
Dusting off some solutions
When asked about his long-term aspirations, Jim is quick to reply.
"In figuring out how soils and rocks fail under loading, a big issue is understanding the basic parameters that govern deformability and strength," he says.
"How can you measure those things effectively and speedily?"
Taking samples and "squeezing and manipulating" them in laboratory settings, Jim is eager to answer just that.
"These tests are not without their limitations though," he affirms.
"It might be better to carry out measurements in situ with a probing instrument or two."
"The science will be getting an index of actual material properties."
"Geotechnical engineers can then tell what to expect when you build infrastructure on, or in, naturally occurring deposits of soil and rock."
Hitting the ground running
Giving roughly equal weight to experimental and theoretical aspects of geomechanics, Dr Jim Hambleton is digging deep to amplify knowledge about the natural w
Career Summary
Biography
I am an Early Career Researcher, having received my PhD in Civil Engineering in June 2010 from the University of Minnesota. My involvement in research started at an early age with an appointment as an Undergraduate Research Assistant in the Department of Mechanical Engineering at the University of Minnesota. In 2005, I completed an internship at Barr Engineering Company in Minneapolis. Since completing my postgraduate studies, I have been employed continuously in a position at the University of Newcastle. I first joined the Priority Research Centre for Geo technical and Materials Modelling in July 2010 as a Research Associate (Level B) and then became a Research Academic (Level C) within the ARC Centre of Excellence for Geo technical Science and Engineering (www.cgse.edu.au) at its inception.
Please visit my personal website (www.jimhambleton.com) for more on my background and interests.
Research ExpertiseMy general areas of interest are in computational plasticity, contact mechanics, geo technical analysis, and analysis of problems involving steady, pseudo-steady, and unsteady plastic flow. My expertise is in modelling problems in geo- and solid mechanics that are characterized by continuous failure and displacement of material via contact with a rigid or flexible object. Specific areas of interest include (1) ploughing and cutting of soils in earth moving operations, (2) installation effects for screw anchors and screw foundations, (3) penetration-based testing for in situ characterization of soil strength and deformability, and (4) soil-wheel interaction for off-road vehicles.
Teaching Expertise
I thoroughly enjoy teaching introductory and advanced courses in geo mechanics, solid mechanics, and numerical methods. I am particularly well-positioned to teach courses in the following subjects, which align directly with my research interests: Undergraduate Level • Statics and Dynamics • Deformable Body Mechanics • Soil Mechanics • Linear Structural Analysis • Matrix Analysis of Structures • Numerical Methods Graduate Level • Continuum Mechanics • Elasticity • Plasticity • Linear Finite Element Analysis • Non-Linear Finite Element Analysis • Contact Mechanics
Administrative Expertise
My administration expertise derives from years of experience in university governance and professional stewardship. I am currently a Member of the Faculty of Engineering and Built Environment Faculty Board. At the University of Minnesota, I was a Member of the Classroom Advisory Subcommittee, a subcommittee of the University Senate charged with providing advice on issues pertaining broadly to teaching and learning in classrooms. My overarching objective in these positions has been to ensure that the representative views of those directly involved in teaching and research are used to shape policy. On a professional level, I currently Chair the local Chapter of the Australian Geo mechanics Society. Part of this role is to actively engage with industry to bring leading national and international researchers to Newcastle to give seminars, short courses and touring lectures (including the Rankine Lecture on behalf of the Institution of Civil Engineers London, the Terzaghi Lecture on behalf of the ASCE, and the E H Davis Lecture in behalf of the AGS). Prior to acting as Chair, I spent three years in the role of Young Geo technical Professional Representative.
Collaborations
My research aims to advance the understanding of how soils are moved and shaped through interaction with man-made objects and machinery. An overarching goal is to develop rigorous, mechanics-based models for predicting soil deformation and the corresponding force requirements or reactions. These problems pose a tremendous challenge due to the confluence of unsteady plastic flow, potentially three-dimensional deformation, contact interaction, material instabilities, and rate effects from inertial forces and hydro mechanical coupling (for saturated or partially saturated soils). Through collaborative research initiatives, I hope to establish new modelling paradigms to help establish accurate, robust, and efficient computational methods. In collaboration with industry leaders and policymakers, I endeavor to realize the full potential of this work as a means of reducing costs and production times, as well as mitigating consumption and pollution.
Qualifications
- Doctor of Philosophy, University of Minnesota - USA
- Bachelor of Civil Engineering, University of Minnesota - USA
- Master of Science, University of Minnesota - USA
Keywords
- Computational Mechanics
- Geomechanics
- Numerical Analysis
- Plasticity
- Soil-Machine Interaction
- Solid Mechanics
Professional Experience
Academic appointment
Dates | Title | Organisation / Department |
---|---|---|
1/1/2014 - | Elected Member | University of Newcastle Faculty of Engineering and Built Environment Australia |
1/1/2014 - | Chair | Australian Geomechanics Society Newcastle Chapter Australia |
1/1/2013 - | Membership - International Association of Computational Mechanics | International Association of Computational Mechanics Australia |
1/2/2011 - 1/11/2011 | Casual Academic | University of Newcastle School of Engineering Australia |
1/6/2010 - 1/11/2011 | Post-doctoral Research Associate | University of Newcastle School of Engineering Australia |
1/1/2010 - 1/12/2013 | Young Geotechnical Professional Representative | Australian Geomechanics Society Newcastle Chapter Australia |
1/1/2009 - | Membership - Geo-Institute | Geo-Institute Australia |
1/1/2007 - | Membership - Engineering Mechanics Institute | Engineering Mechanics Institute Australia |
1/1/2006 - 1/6/2009 |
Teaching Assistant Teaching Assistantship |
University of Minnesota Department of Civil Engineering United States |
1/1/2006 - | Membership - Minnesota Geotechnical Society | Minnesota Geotechnical Society United States |
1/8/2005 - 1/6/2010 |
Graduate Research Assistant Assistantship |
University of Minnesota Department of Civil Engineering United States |
1/8/2003 - 1/8/2005 |
Undergraduate Research Assistant Research Asisstantship |
University of Minnesota Department of Mechanical Engineering United States |
1/1/2003 - | Membership - American Society of Civil Engineers | American Society of Civil Engineers United States |
1/11/2002 - 1/8/2005 | Educator and Technician | University of Minnesota Center for Youth Development- Engineering Education United States |
Professional appointment
Dates | Title | Organisation / Department |
---|---|---|
1/6/2005 - 1/9/2005 | Engineering and Design Intern | Barr Engineering Co. Structural and Geotechnical Engineering United States |
Awards
Honours
Year | Award |
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2014 |
ASCE New Faces of Civil Engineering Honouree Unknown |
2005 |
Simon and Claire Benson Award for Outstanding Undergraduate Achievement University of Minnesota |
2005 |
High Distinction University of Minnesota |
Research Award
Year | Award |
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2014 |
Excellent Paper Award International Association for Computer Methods and Advances in Geomechanics |
2010 |
International Research Fellowship (offered; not accepted) Unknown |
2010 |
Neville G. W. Cook Award for Innovative Research in Geomechanics University of Minnesota |
Publications
For publications that are currently unpublished or in-press, details are shown in italics.
Chapter (1 outputs)
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2018 |
Muñoz JJ, Hambleton J, Sloan SW, 'R-adaptivity in limit analysis', Advances in Direct Methods for Materials and Structures, Springer International Publishing, Cham, Switzerland 73-84 (2018) [B1]
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Journal article (30 outputs)
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2023 |
Shi Z, Wood DM, Huang M, Hambleton JP, 'Tay creep: A multi-mechanism model for rate-dependent deformation of soils', Geotechnique, 73 310-322 (2023) Constitutive models constructed within the combined framework of kinematic hardening and bounding surface plasticity have proved to be successful in describing the rate-independen... [more] Constitutive models constructed within the combined framework of kinematic hardening and bounding surface plasticity have proved to be successful in describing the rate-independent deformation of soils under non-monotonic histories of stress or strain. Most soils show some rate-dependence of their deformation characteristics, and it is important for the constitutive models to be able to reproduce rate-or time-dependent patterns of response. This paper explores a constitutive modelling approach that combines multiple viscoplastic mechanisms contributing to the overall rate-sensitive deformation of a soil. A simple viscoplastic extension of an inviscid kinematic hardening model incorporates two viscoplastic mechanisms applying an overstress formulation to a consolidation surface' and a recent stress history surface'. Depending on the current stress state and the relative strength' of the two mechanisms, the viscoplastic mechanisms may collaborate or compete with each other. This modelling approach is shown to be able to reproduce many observed patterns of rate-dependent response of soils.
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2022 |
Martinez A, DeJong J, Akin I, Aleali A, Arson C, Atkinson J, et al., 'Bio-inspired geotechnical engineering: Principles, current work, opportunities and challenges', Geotechnique, 72 687-705 (2022) [C1] A broad diversity of biological organisms and systems interact with soil in ways that facilitate their growth and survival. These interactions are made possible by strategies that... [more] A broad diversity of biological organisms and systems interact with soil in ways that facilitate their growth and survival. These interactions are made possible by strategies that enable organisms to accomplish functions that can be analogous to those required in geotechnical engineering systems. Examples include anchorage in soft and weak ground, penetration into hard and stiff subsurface materials and movement in loose sand. Since the biological strategies have been 'vetted' by the process of natural selection, and the functions they accomplish are governed by the same physical laws in both the natural and engineered environments, they represent a unique source of principles and design ideas for addressing geotechnical challenges. Prior to implementation as engineering solutions, however, the differences in spatial and temporal scales and material properties between the biological environment and engineered system must be addressed. Current bio-inspired geotechnics research is addressing topics such as soil excavation and penetration, soil-structure interface shearing, load transfer between foundation and anchorage elements and soils, and mass and thermal transport, having gained inspiration from organisms such as worms, clams, ants, termites, fish, snakes and plant roots. This work highlights the potential benefits to both geotechnical engineering through new or improved solutions and biology through understanding of mechanisms as a result of cross-disciplinary interactions and collaborations.
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2021 |
Shi Z, Huang M, Hambleton JP, 'Possibilities and limitations of the sequential kinematic method for simulating evolutionary plasticity problems', Computers and Geotechnics, 140 (2021) [C1] Evolutionary plasticity processes, such as ploughing and penetrating, widely exist in many geotechnical engineering applications. The simulation of these processes poses considera... [more] Evolutionary plasticity processes, such as ploughing and penetrating, widely exist in many geotechnical engineering applications. The simulation of these processes poses considerable challenges due to the occurrence of large deformation, unsteady nature of the material free surface, and inherent coupling between mechanical response and material geometries. This paper explores the possibility of simulating the first-order response of these processes by using sequential kinematic method (SKM) in combination with simple deformation mechanism. The mechanism consists of rigid elements separated by velocity discontinuities. Computations based on the kinematic approach of limit analysis are sequentially performed to evaluate the most likely deformation mode and update material geometries. An r-adaptive kinematic formulation is used that captures versatile velocity fields by optimizing the geometries of simple kinematic mechanism. The modelling methodology is studied in detail for two archetypal evolutionary plasticity problems: wedge ploughing Tresca material and cylinder penetrating undrained clay. The numerical results obtained by using the SKM are compared against existing analytical and numerical solutions, as well as experimental evidence. The paper demonstrates that evolutionary plasticity problems can be simulated in a conceptually simple way using SKM and highlights the potential pitfalls of this technique.
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2020 |
Shi Z, Hambleton JP, 'An r-h adaptive kinematic approach for 3D limit analysis', COMPUTERS AND GEOTECHNICS, 124 (2020) [C1]
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2017 |
Hambleton JP, Stanier SA, 'Predicting wheel forces using bearing capacity theory for general planar loads', International Journal of Vehicle Performance, 3 71-88 (2017) [C1]
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2016 |
Iwanec AMS, Carter JP, Hambleton JP, 'Geomechanics of subsidence above single and multi-seam coal mining', JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING, 8 304-313 (2016) [C1]
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2016 |
Stanier S, Dijkstra J, Lesniewska D, Hambleton J, White D, Muir Wood D, 'Vermiculate artefacts in image analysis of granular materials', Computers and Geotechnics, 72 100-113 (2016) [C1]
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2016 |
Hambleton JP, Sloan SW, 'A simplified kinematic method for 3D limit analysis', Applied Mechanics and Materials, 846 342-347 (2016) [C1]
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2015 |
Yu SB, Hambleton JP, Sloan SW, 'Undrained uplift capacity of deeply embedded strip anchors in non-uniform soil', Computers and Geotechnics, 70 41-49 (2015) [C1]
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2014 |
Hambleton JP, Stanier SA, Gaudin C, Todeshkejoei K, 'Analysis of installation forces for helical piles in clay', Australian Geomechanics, 49 73-79 (2014) [C1]
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2014 |
Gaudin C, O'Loughlin CD, Randolph MF, Cassidy MJ, Wang D, Tian Y, et al., 'Advances in offshore and onshore anchoring solutions', Australian Geomechanics, 49 59-71 (2014) [C1]
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2014 |
Hambleton JP, Kouretzis GP, Sloan SW, 'Introduction to the CGSE Special Issue of Australian Geomechanics', Australian Geomechanics, 49 1-2 (2014) [C3]
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2014 |
Yu SB, Hambleton JP, Sloan SW, 'Analysis of Inclined Strip Anchors in Sand Based on the Block Set Mechanism', Applied Mechanics and Materials, 553 422-427 (2014) [C1]
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2014 |
Hambleton JP, Stanier SA, White DJ, Sloan SW, 'Modelling ploughing and cutting processes in soils', Australian Geomechanics Journal, 49 147-156 (2014) [C1] Economic growth in Australia and the rest of the world is linked to the scale of construction and mining, and the amount of earth moved each year in these operations is difficult ... [more] Economic growth in Australia and the rest of the world is linked to the scale of construction and mining, and the amount of earth moved each year in these operations is difficult to fathom. When distributed evenly across the world's population, each individual moves several tonnes of earth each year. This paper highlights current and future research initiatives within the ARC Centre of Excellence for Geotechnical Science and Engineering (CGSE) aimed at developing rigorous, mechanics-based models for fundamental ploughing and cutting processes in soils. State-of-the-art physical modelling is integrated with the development of new techniques for analytical and numerical modelling to elucidate and predict the full progression of forces and deformations in both two-dimensional and three-dimensional processes. A new analytical model for cutting in dry sand is presented, and preliminary results from numerical and physical modelling are described. The analyses reveal effects that available models fail to consider and illustrate how the development of rigorous models may facilitate improvements in production and efficiency in earthmoving operations.
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2013 |
Hambleton JP, Sloan SW, 'A perturbation method for optimization of rigid block mechanisms in the kinematic method of limit analysis', Computers and Geotechnics, 48 260-271 (2013) [C1]
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2013 |
Hambleton JP, Buzzi O, Giacomini A, Spadari M, Sloan SW, 'Perforation of Flexible Rockfall Barriers by Normal Block Impact', ROCK MECHANICS AND ROCK ENGINEERING, 46 515-526 (2013) [C1]
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2012 |
Spadari M, Giacomini A, Buzzi OP, Hambleton JP, 'Prediction of the bullet effect for rockfall barriers: A scaling approach', Rock Mechanics and Rock Engineering, 45 131-144 (2012) [C1]
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2011 |
Fitchett T, Hambleton J, Hazelton P, Klinefelter A, Wright J, 'Law Library Budgets in Hard Times', LAW LIBRARY JOURNAL, 103 91-111 (2011)
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2011 |
Abbo AJ, Lyamin AV, Sloan SW, Hambleton JP, 'A C2 continuous approximation to the Mohr-Coulomb yield surface', International Journal of Solids and Structures, 48 3001-3010 (2011) [C1]
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2007 |
Hambleton JP, Drescher A, 'Modeling test rolling on cohesive subgrades', ADVANCED CHARACTERISATION OF PAVEMENT SOIL ENGINEERING MATERIALS, VOLS 1 AND 2, 359-368 (2007)
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Show 27 more journal articles |
Conference (30 outputs)
Year | Citation | Altmetrics | Link | |||||
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2022 | Lee H, Ponkshe N, Hambleton JP, Van de Ven JD, 'Characterization of Mechanical Properties of a Synthetic Modeling Clay Used as a Substitute for Natural Soils', GEO-CONGRESS 2022: SITE AND SOIL CHARACTERIZATION, COMPUTATIONAL GEOTECHNICS, RISK, AND LESSONS LEARNED, Charlotte, NC (2022) [E1] | |||||||
2021 |
Yang Q, Hambleton JP, 'Data-driven modeling of granular column collapse', Geo-Extreme 2021: Infrastructure Resilience, Big Data, and Risk, Savannah, Georgia (2021) [E1]
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2020 |
Hambleton JP, Makhnenko R, Budge AS, 'Preface', Geotechnical Special Publication (2020)
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2017 |
Graham D, Shi Z, Hambleton JP, Kouretzis GP, 'Limit loads for pipelines and cylinders partially embedded in frictional materials', 51st US Rock Mechanics / Geomechanics Symposium 2017, San Francisco, CA (2017) [E1]
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2015 |
Kashizadeh E, Hambleton JP, Stanier SA, 'A numerical approach for modelling the ploughing process in sands', Computer Methods and Recent Advances in Geomechanics - Proceedings of the 14th Int. Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014 (2015) [E1] Ploughing processes are difficult to simulate using conventional approaches due to the occurrence of extremely large, predominantly plastic deformation. Numerical techniques such ... [more] Ploughing processes are difficult to simulate using conventional approaches due to the occurrence of extremely large, predominantly plastic deformation. Numerical techniques such as the Material Point Method and the Discrete Element Method are, in principle, capable of reproducing the deformation observed in these evolutionary processes, but they are not without drawbacks, the most significant being the large processing times required. This paper presents a new numerical technique for modeling the ploughing process in sands. The method rests on the assumption that deformation occurs in the formof strong discontinuities, or shear bands, and considers the full process as a sequence of incipient collapse problems.Within an increment of deformation, the collapse mechanism furnishing the least resistance is used to update the deformed configuration and evaluate force. The model incorporates the effect of softening within the shear bands, as well as material avalanching observed as the slope of the free surface reaches the critical angle at which instabilities occur. Theoretical predictions are compared to experiments, and the basic similarities and difference are discussed. © 2015 Taylor & Francis Group, London.
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2015 |
Todeshkejoei C, Hambleton JP, Stanier SA, Gaudin C, 'Modelling installation of helical anchors in clay', Computer Methods and Recent Advances in Geomechanics - Proceedings of the 14th Int. Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014 (2015) [E1] Helical anchors, which are mostly used to resist uplift, are deep foundations installed by rotation into the ground. Despite the central role of the installation process, especial... [more] Helical anchors, which are mostly used to resist uplift, are deep foundations installed by rotation into the ground. Despite the central role of the installation process, especially with respect to the effect of soil disturbance, relatively little is known about the forces and deformations occurring during installation. An exception is the field verification technique known as torque-capacity correlation, which attempts to relate installation torque directly to uplift capacity. However, there are open questions regarding this approach, since not all significant parameters, such as installation vertical force and helix pitch, are taken into consideration. This could be one of the main reasons behind the wide range of torque-correlation factors reported in the literature. This study presents a three-dimensional numerical analysis of the installation process for helical anchors in clay. The results are synthesised into convenient yield envelopes that predict the relationship between installation torque and normal force as functions of helix pitch, roughness, and thickness. The application of the findings to torque-capacity correlation is also discussed. © 2015 Taylor & Francis Group, London.
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2014 |
Suchowerska AM, Carter JP, Hambleton JP, Merifield RM, 'Effect of constitutive behaviour of strata on the prediction of subsidence above single-seam and multi-seam supercritical longwall panels', 9th Triennial Conference on Mine Subsidence, Pokolbin, Australia (2014) [E1]
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2014 |
Suchowerska AM, Hambleton JP, Carter JP, 'Prediction of roof collapse for rectangular underground openings', AusRock 2014: Third Australasian Ground Control in Mining Conference Proceedings, Sydney, NSW (2014) [E1]
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2012 |
Hambleton JP, Buzzi OP, Giacomini A, Spadari M, Sloan SW, 'Perforation of rockfall protection barriers by normal block impact', 46th US Rock Mechanics / Geomechanics Symposium 2012, Chicago, IL (2012) [E1]
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2011 |
Hambleton JP, Sloan SW, Pyatigorets AV, Voller VR, 'Lower bound limit analysis using the Control Volume Finite Element Method', Computer Methods for Geomechanics: Frontiers and New Applications. Volume 1, Melbourne, VIC (2011) [E1]
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2011 |
Hambleton JP, Sloan SW, 'Coordinate perturbation method for upper bound limit analysis', COMGEO II - Proceedings of the 2nd International Symposium on Computational Geomechanics, Cavtat, Croatia (2011) [E1]
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2010 |
Eggen M, Mantell SC, Davidson JH, 'Mechanical Behavior of Random Fiber Composite Perforated Plates', JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME (2010)
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2008 |
Hambleton J, Drescher A, 'Soil damage models for off-road vehicles', Geotechnical Special Publication (2008) Off-road vehicles such as ATVs, SUVs, dirt bikes, and hauling trucks cause damage to soft soils in unpaved areas within parks, forests, wetlands, and tundra. These vehicles can fo... [more] Off-road vehicles such as ATVs, SUVs, dirt bikes, and hauling trucks cause damage to soft soils in unpaved areas within parks, forests, wetlands, and tundra. These vehicles can form deep ruts which result in destruction of vegetation, changes in water absorption/retention, and reduction in aesthetical land values. Large areas of particularly vulnerable soils are becoming increasingly common in northern regions, where permafrost is disappearing as a result of climate change. In this paper, theoretical models that predict the effect of material properties, wheel geometry, and wheel load on wheel penetration and rutting in cohesive soils are presented. The effects of tire flexibility are considered, as well. The models are approximate, yet predict similar response as that obtained from comprehensive numerical simulation. Copyright ASCE 2008.
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2005 |
Eggen M, Hambleton J, Mantell SC, Davidson J, 'Mechanical behavior of random fiber composite perforated plates', 20th Technical Conference of the American Society for Composites 2005 (2005) In this study, the mechanical behavior of perforated, chopped fiber reinforced polymer plates is investigated. These plates serve as a manifold for polymer heat exchangers, where ... [more] In this study, the mechanical behavior of perforated, chopped fiber reinforced polymer plates is investigated. These plates serve as a manifold for polymer heat exchangers, where each perforation would be connected to a tube carrying pressurized fluid. Thus, the plates are subjected to a pressure loading. In order to predict the plate deformation due to the pressure loading, the mechanical bending behavior of these plates is quantified by an equivalent plate modulus E* and equivalent Poisson's ratio ¿*, such that the perforated plate can be modeled as a solid plate. Previous research has shown that by normalizing E* with respect to the modulus of a non-perforated plate, the bending behavior of perforated plates fabricated from isotropic elastic materials was a function of the hole size, spacing and plate thickness. Machining holes in a random fiber composite creates local areas of reduced stiffness due to fiber chopping, while the previous methods used to characterize E*/E assumed uniform, isotropic material properties. The objective of this study is to demonstrate that machined chopped fiber reinforced perforated plates, which have local areas of reduced modulus near the holes, can be characterized by E*/E (an approach which assumes global isotropy). Experimental values for E*/E for non-reinforced (isotropic) and chopped fiber reinforced polymer plates are obtained for a range of hole geometries and two different polymers. These experimental results for E*/E are compared to a model developed for isotropic, elastic materials and also to a finite element solution. |
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Show 27 more conferences |
Other (9 outputs)
Year | Citation | Altmetrics | Link |
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2013 | Todeshkejoei C, Hambleton JP, Gaudin C, Stanier SA, Merifield RM, 'Effects of installation on the capacity of helical anchors in clay', ARC Centre of Excellence for Geotechnical Science and Engineering 2013 Annual Report ( pp.65-66). Callaghan, Australia: ARC Centre of Excellence for Geotechnical Science and Engineering (2013) | ||
2013 | Hambleton JP, Kashizadeh E, 'Simulation of ploughing and cutting in soil by incremental limit analysis', Proceedings of the 12th US National Congress on Computational Mechanics (2013) | ||
2013 | Hambleton JP, Kashizadeh E, 'A numerical approach for modeling evolutionary problems in geomechanics', Proceedings of the Engineering Mechanics Institute Conference (EMI2013) (2013) | ||
Show 6 more others |
Report (1 outputs)
Year | Citation | Altmetrics | Link |
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2008 | Hambleton JP, Drescher A, 'Development of Improved Test Rolling Methods for Roadway Embankment Construction, Final Report', Minnesota Local Road Research Board, 288 (2008) |
Thesis / Dissertation (2 outputs)
Year | Citation | Altmetrics | Link |
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2010 | Hambleton JP, Modeling Test Rolling in Clay, University of Minnesota (2010) | ||
2006 | Hambleton JP, Plastic Analysis of Processes Involving Material-Object Interaction, University of Minnesota (2006) |
Grants and Funding
Summary
Number of grants | 6 |
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Total funding | $109,876 |
Click on a grant title below to expand the full details for that specific grant.
20162 grants / $105,061
Innovating earthmoving mechanics for next-generation infrastructure$98,200
Funding body: ARC (Australian Research Council)
Funding body | ARC (Australian Research Council) |
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Project Team | Doctor James Hambleton |
Scheme | Discovery Early Career Researcher Award (DECRA) |
Role | Lead |
Funding Start | 2016 |
Funding Finish | 2018 |
GNo | G1500271 |
Type Of Funding | Aust Competitive - Commonwealth |
Category | 1CS |
UON | Y |
2016 International Visitor from ETH Zürich – Swiss Federal Institute of Technology Zürich, Switzerland$6,861
Funding body: University of Newcastle
Funding body | University of Newcastle |
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Project Team | Doctor James Hambleton, Professor Alexander Puzin |
Scheme | International Research Visiting Fellowship |
Role | Lead |
Funding Start | 2016 |
Funding Finish | 2016 |
GNo | G1501027 |
Type Of Funding | Internal |
Category | INTE |
UON | Y |
20151 grants / $1,215
2nd Australasian Conference on Computational Mechanics, QUT Gardens Point Campus, Brisbane, Australia, 30 Nov - 1 Dec 2015$1,215
Funding body: University of Newcastle - Faculty of Engineering & Built Environment
Funding body | University of Newcastle - Faculty of Engineering & Built Environment |
---|---|
Project Team | Doctor James Hambleton |
Scheme | Travel Grant |
Role | Lead |
Funding Start | 2015 |
Funding Finish | 2015 |
GNo | G1501058 |
Type Of Funding | Internal |
Category | INTE |
UON | Y |
20141 grants / $1,200
14th International Conference of the International Association for Computer Methods and Advances in Geomechanics, Kyoto, Japan, 22-25 September 2014$1,200
Funding body: University of Newcastle - Faculty of Engineering & Built Environment
Funding body | University of Newcastle - Faculty of Engineering & Built Environment |
---|---|
Project Team | Doctor James Hambleton |
Scheme | Travel Grant |
Role | Lead |
Funding Start | 2014 |
Funding Finish | 2014 |
GNo | G1400796 |
Type Of Funding | Internal |
Category | INTE |
UON | Y |
20131 grants / $1,200
Engineering Mechanics Institute Conference 2013, USA 4-7 August 2013$1,200
Funding body: University of Newcastle - Faculty of Engineering & Built Environment
Funding body | University of Newcastle - Faculty of Engineering & Built Environment |
---|---|
Project Team | Doctor James Hambleton |
Scheme | Travel Grant |
Role | Lead |
Funding Start | 2013 |
Funding Finish | 2013 |
GNo | G1300764 |
Type Of Funding | Internal |
Category | INTE |
UON | Y |
20121 grants / $1,200
46th US Rock Mechanics/Geomechanics Symposium, Chicago, USA, 24 - 27 June 2012$1,200
Funding body: University of Newcastle - Faculty of Engineering & Built Environment
Funding body | University of Newcastle - Faculty of Engineering & Built Environment |
---|---|
Project Team | Doctor James Hambleton |
Scheme | Travel Grant |
Role | Lead |
Funding Start | 2012 |
Funding Finish | 2013 |
GNo | G1200410 |
Type Of Funding | Internal |
Category | INTE |
UON | Y |
Research Supervision
Number of supervisions
Past Supervision
Year | Level of Study | Research Title | Program | Supervisor Type |
---|---|---|---|---|
2019 | PhD | Mechanics of Screw Piles in Clay | PhD (Civil Eng), College of Engineering, Science and Environment, The University of Newcastle | Principal Supervisor |
2018 | PhD | Adaptive Discontinuity Layout Optimisation For Geotechnical Stability Analysis | PhD (Civil Eng), College of Engineering, Science and Environment, The University of Newcastle | Co-Supervisor |
2018 | Masters | Theoretical and Experimental Analysis of the Cutting Process in Sand | M Philosophy (Civil Eng), College of Engineering, Science and Environment, The University of Newcastle | Principal Supervisor |
2014 | PhD | The Geomechanics of Single-seam and Multi-seam Longwall Coal Mining | PhD (Civil Eng), College of Engineering, Science and Environment, The University of Newcastle | Co-Supervisor |
News
News • 3 Nov 2015
ARC DECRA funding success
Dr James Hambleton has been awarded $350,000 in ARC Discovery Early Career Researcher Award (DECRA) funding commencing in 2016 for his research project Innovating earthmoving mechanics for next-generation infrastructure.
News • 5 Dec 2013
New Face of Civil Engineering
The American Society of Civil Engineers (ASCE) has named UON research academic Dr James Hambleton as one of 10 New Faces of Civil Engineering.
Dr James Hambleton
Position
Honorary Senior Lecturer
ARC Centre of Excellence for Geotechnical Science and Engineering, Centre for Geotechnical and Materials Modelling
School of Engineering
College of Engineering, Science and Environment
Focus area
Civil Engineering
Contact Details
james.hambleton@newcastle.edu.au | |
Phone | (02) 4921 5893 |
Mobile | (04) 2221 5207 |
Fax | (02) 4921 6946 |
Office
Room | EA 215 |
---|---|
Building | Engineering Administration |
Location | Callaghan University Drive Callaghan, NSW 2308 Australia |