A study of soil as a structured frictional continuum
A study of soil as a structured frictional continuum
The thesis is mainly concerned with continuum models for soil, relating particularly to constitutive equations. The basic mechanical behaviour of soil was investigated based on such assumptions and restrictions as isothermal and static processes, non-rotational deformations, and material isotropy.The basic theory of continuum mechanics is briefly reviewed and the key features of the mechanical behaviour of soils are described based on the experimental properly selected results. Two yielding mechanisms, i.e., volumetric yielding due to mean stress change and shear yielding with volume change, are discussed. Current soil models are also briefly reviewed by comparing with soil behaviour. A three dimensional kinematic model for dilating material was developed by extending a planar double slip model to four-fold slip planes with saw-tooth structure. By combining this with a yield condition, a procedure to find the corresponding plastic potential was proposed. A perfectly plastic model and a elastic-strain hardening plastic model for dilating frictional material were developed in order to describe the drained behaviour of normally- or over-consolidated soil. Dilating materials are interpreted as structured continua which result in kinematic coupling between shear and volumetric strain rates.
University of Southampton
1981
Nishinakagawa, Kou
(1981)
A study of soil as a structured frictional continuum.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
The thesis is mainly concerned with continuum models for soil, relating particularly to constitutive equations. The basic mechanical behaviour of soil was investigated based on such assumptions and restrictions as isothermal and static processes, non-rotational deformations, and material isotropy.The basic theory of continuum mechanics is briefly reviewed and the key features of the mechanical behaviour of soils are described based on the experimental properly selected results. Two yielding mechanisms, i.e., volumetric yielding due to mean stress change and shear yielding with volume change, are discussed. Current soil models are also briefly reviewed by comparing with soil behaviour. A three dimensional kinematic model for dilating material was developed by extending a planar double slip model to four-fold slip planes with saw-tooth structure. By combining this with a yield condition, a procedure to find the corresponding plastic potential was proposed. A perfectly plastic model and a elastic-strain hardening plastic model for dilating frictional material were developed in order to describe the drained behaviour of normally- or over-consolidated soil. Dilating materials are interpreted as structured continua which result in kinematic coupling between shear and volumetric strain rates.
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Published date: 1981
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Local EPrints ID: 459676
URI: http://eprints.soton.ac.uk/id/eprint/459676
PURE UUID: 687c0e8a-6dda-4097-bfb2-4b2109b9b347
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Date deposited: 04 Jul 2022 17:16
Last modified: 04 Jul 2022 17:16
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Author:
Kou Nishinakagawa
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