Dilatancy equation and generalized plastic constitutive model for coarse-grained soils

GUO Wan-li; ZHU Jun-gao; PENG Wen-ming

doi:10.11779/CJGE201806016

Volume 40 Issue 6

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Chinese Journal of Geotechnical Engineering > 2018 > 40(6): 1103-1110. > DOI: 10.11779/CJGE201806016

GUO Wan-li, ZHU Jun-gao, PENG Wen-ming. Dilatancy equation and generalized plastic constitutive model for coarse-grained soils[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(6): 1103-1110. DOI: 10.11779/CJGE201806016

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Dilatancy equation and generalized plastic constitutive model for coarse-grained soils

1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China;
2. Key Laboratory of Failure Mechanism and Safety Control Techniques of Earth-Rock Dam of the Ministry of Water Resources, Nanjing 210024, China;
3. China Power Construction Group Chengdu Survey and Design Institute Limited, Chengdou 610072, China

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Received Date: February 03, 2017
Published Date: June 24, 2018

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Abstract

A new dilatancy equation is proposed by adding a factor to the dilatancy equation of Cambridge model, and this factor can adjust the shape of curve between the dilatancy ratio and the stress ratio for coarse-grained soils, and can reflect the nonlinear relationship. Thus a new constitutive model based on the generalized plastic theory is proposed. The main conclusions are as follows: (1) The method of determining the parameters of the proposed dilatancy equation is simple, and its capability to reflect the dilatancy properties of coarse-grained soils is verified by CD tests; (2) There are 9 parameters in this model and their definitions are clear, and the methods to determine parameters through the indoor tests are given; (3) According to the generalized plastic constitutive model, the stiffness matrix under the general stress state is deduced, and the triaxial constant p tests and two-stage constant-stress-ratio tests are carried out to verify its rationality.
- coarse-grained soil,
- dilatancy equation,
- generalized plastic theory,
- elasto-plasticity,
- constitutive model

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Dilatancy equation and generalized plastic constitutive model for coarse-grained soils

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