【摘要】 非饱和土应力状态是采用有效应力(σ–ua)和基质吸力(ua–uw)作为应力状态变量,相应的Mohr-Coulomb破坏包面是在有效应力、基质吸力和剪应力的三维坐标系中的曲面(通常在应用中假定为平面)。根据应变等效性原理定义损伤变量,由非饱和土给出损伤变量与偏应力的曲线,并得到非饱和土的损伤阈值与基质吸力呈指数函数关系。采用一非饱和土土坡开挖过程的算例,说明基于损伤演化描述的稳定性数值分析方法可行。更多还原

【Abstract】 The effective stress(σ–ua) and the matric suction(ua–uw) are regarded as variable of state to describe the stress state of unsaturated soil;so its Mohr-Coulomb shear failure plane is a curved face(usually assumpted as plane face) in three-dimensional system of coordinate that is made up by effective stress,matric suction and shear stress.The damage variable of unsaturated soil is defined based on equivalent strain principle.In light of triaxial test,the relationship between damage variable and deviatoric stress is fitted;and the relationship between damage threshold stress and matric suction is shown as the exponential function.As an example,method of stabilization numerical analysis for a slope of unsaturated soil is given.更多还原