A simple constitutive model for granular soils: Modified stress-dilatancy approach
A simple constitutive model for granular soils: Modified stress-dilatancy approach
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DOI：
10.1016/s0266-352x(98)00004-4
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发表时间：
1998
影响因子：
5.3
通讯作者：
R. Wan;P. Guo
中科院分区：
文献类型：
--
作者：
R. Wan;P. Guo
粒状土的行为对孔隙比和应力的依赖关系是在塑性理论内模拟的，该理论由修改后的应力-应变定律丰富。在宪法的发展过程中保持了简单性，以便将来在有限的要素代码中实施。通过引入一个孔隙比相关因子来衡量当前孔隙比与临界孔隙比的偏差，对Rowe的应力双方差方程进行了修正。这一修改确实对应于一个新的能量耗散方程的颗粒组装，它维持运动学约束下的应力的作用。建议的本构关系预测在一个非常一致的方式在单调加载条件下的砂的响应，初始孔隙比和围压的大范围内，而不需要作出任何调整的材料参数。成功地模拟了萨克拉门托河砂排水三轴压缩的众所周知的已发表数据。
The dependencies of granular soil behaviour on void ratio and stress are modelled within plasticity theory enriched by a modified stress-dilatancy law. Simplicity has been kept in the development of the constitutive law for easy future implementation in afinite element code. By using a void ratio dependent factor which measures the deviation of the current void ratio from the critical one, Rowe's stress dilatancy equation is modified. This modification indeed corresponds to a new energy dissipation equation for a granular assembly which sustains kinematical constraints under the action of stresses. The proposed constitutive law predicts in a very consistent manner the response of sands in monotonic loading conditions for a large range of initial void ratios and confining pressures without the need to make any adjustments to the material parameters. Well known published data for the drained triaxial compression of Sacramento River sand was successfully modelled.