Soil/structure interaction of temporary roadways
Soil/structure interaction of temporary roadways
A series of tests on model temporary military trackway, subject to vehicle loads, on a soft over-consolidated clay was carried out at the London Geotechnical Centrifuge Centre. Two of the tests were conducted under plane strain conditions and analysed the effects of static and cyclic 'whole vehicle loads' on trackway performance. The other two used a rolling vehicle to impose traffic loads on unjointed and jointed trackway respectively, to assess the effects of trackway joint on the underlying soil and to determine the sequence of events involved in the onset of trackway failure.
A series of finite element analyses using the critical state soils program CRISP was undertaken in which it was attempted to model the centrifuge models. Two-dimensional analyses were used to model the plane strain centrifuge tests, and three-dimensional analyses for tests involving the rolling vehicle. A two-dimensional effective stress slip element, and a three-dimensional slip element were developed to assist in re-creating the interface between stiff aluminium trackway and soft clay. The results were in good agreement, allowing further analyses to be carried out with modified soil and trackway properties.
The centrifuge tests and finite element analyses showed that soil/trackway failure is not typically caused by bearing capacity failure of the soil, or by degradation of the soil due to cyclic loading. It is due to very high soil/trackway contact stresses generated by the low-bending-stiffness articulated joints causing immediate failure of a thin surface layer of the soil. Soil/trackway displacements accumulate as degraded soil is driven aside and successively deeper layers of soil are exposed.
Existing trackway performance could be improved significantly by enhancing its stiffness in the direction of vehicle travel: either by increasing the joint interval, restraining panels against rotation or by designing a new, more effective, trackway system.
University of Southampton
Lees, Andrew Steven
80c56f92-d3b7-4677-b816-b3125e39da0c
2000
Lees, Andrew Steven
80c56f92-d3b7-4677-b816-b3125e39da0c
Lees, Andrew Steven
(2000)
Soil/structure interaction of temporary roadways.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
A series of tests on model temporary military trackway, subject to vehicle loads, on a soft over-consolidated clay was carried out at the London Geotechnical Centrifuge Centre. Two of the tests were conducted under plane strain conditions and analysed the effects of static and cyclic 'whole vehicle loads' on trackway performance. The other two used a rolling vehicle to impose traffic loads on unjointed and jointed trackway respectively, to assess the effects of trackway joint on the underlying soil and to determine the sequence of events involved in the onset of trackway failure.
A series of finite element analyses using the critical state soils program CRISP was undertaken in which it was attempted to model the centrifuge models. Two-dimensional analyses were used to model the plane strain centrifuge tests, and three-dimensional analyses for tests involving the rolling vehicle. A two-dimensional effective stress slip element, and a three-dimensional slip element were developed to assist in re-creating the interface between stiff aluminium trackway and soft clay. The results were in good agreement, allowing further analyses to be carried out with modified soil and trackway properties.
The centrifuge tests and finite element analyses showed that soil/trackway failure is not typically caused by bearing capacity failure of the soil, or by degradation of the soil due to cyclic loading. It is due to very high soil/trackway contact stresses generated by the low-bending-stiffness articulated joints causing immediate failure of a thin surface layer of the soil. Soil/trackway displacements accumulate as degraded soil is driven aside and successively deeper layers of soil are exposed.
Existing trackway performance could be improved significantly by enhancing its stiffness in the direction of vehicle travel: either by increasing the joint interval, restraining panels against rotation or by designing a new, more effective, trackway system.
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Published date: 2000
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Local EPrints ID: 464165
URI: http://eprints.soton.ac.uk/id/eprint/464165
PURE UUID: 170afa4a-3c4f-4da8-9586-09562bc19142
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Date deposited: 04 Jul 2022 21:21
Last modified: 16 Mar 2024 19:18
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Author:
Andrew Steven Lees
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