库水位升降引起的滑坡变形具有显著的时间效应,表现出明显的蠕变特征。根据殷建华的3-D EVP模型,采用π平面推导了不考虑主应力方向,只考虑主应力大小的各向同性的饱和土体剪切蠕变本构模型,以及采用八面体推导了既考虑主应力方向又考虑主应力大小的饱和土体剪切蠕变本构模型。
Landslide deformation caused by the rise and fall of reservoir level has a significant time effect, which shows obvious creep characteris- tics. According to YIN Jian-hua of the 3-D EVP model, it deduced isotropie saturated soil shear creep constitutive model equations which without considering the main stress direction and only considering principal stress size and used octahedral to deduce saturated soil shear creep constitutive model equations which considering the main stress direction and taking into account principal stress size, thus simulating saturated soil under differ- ent shear stress state creep constitutive equation.