An elasto-plastic critical state framework for unsaturated soil
An elasto-plastic critical state framework for unsaturated soil
复制标题
DOI：
10.1680/geot.1995.45.1.35
复制
发表时间：
1995-02
期刊：
影响因子：
5.8
通讯作者：
S. Wheeler;V. Sivakumar
中科院分区：
文献类型：
--
作者：
S. Wheeler;V. Sivakumar
从一系列控制吸力三轴试验的数据对压实的白高岭土样品用于非饱和土弹塑性临界状态框架的发展。框架是根据四个状态变量来定义的：平均净应力、偏应力、吸力和比容。所提出的框架包括一个各向同性的正常压缩超线，一个临界状态超线和一个状态边界超曲面。对于位于状态边界超表面内的状态，假定土的行为是弹性的，在状态边界超表面上的移动对应于应力空间中屈服面的扩展。润湿过程中的膨胀和崩塌模式、各向同性加载过程中的弹塑性压缩行为以及抗剪强度随吸力的增加都与屈服面形状和状态边界形式所定义的硬化规律有关。假设恒吸力横截面…
Data from a series of controlled suction triaxial tests on samples of compacted speswhite kaolin were used in the development of an elasto–plastic critical state framework for unsaturated soil. The framework is defined in terms of four state variables: mean net stress, deviator stress, suction and specific volume. Included within the proposed framework are an isotropic normal compression hyperline, a critical state hyperline and a state boundary hypersurface. For states that lie inside the state boundary hypersurface the soil behaviour is assumed to be elastic, with movement over the state boundary hypersurface corresponding to expansion of a yield surface in stress space. The pattern of swelling and collapse observed during wetting, the elastic–plastic compression behaviour during isotropic loading and the increase of shear strength with suction were all related to the shape of the yield surface and the hardening law defined by the form of the state boundary. By assuming that constant–suction cross–secti...