Natural soil is usually nonhomogeneity and anisotropy. However

the calculation methods of stability against upheaval which are commonly used are applicable to isotropic and homogeneous soils. Considering the failure criterion of nonhomogeneous nonlinear anisotropic rocks and the primary anisotropy of soil

assuming Prandtl failure mode

analysis of stability against upheaval is given using the model of foundation pit bearing capacity. According to capacity calculated by the slip line method and using finite difference method combined with boundary conditions

the related calculation program is compiled； then stability coefficient against upheaval is defined. The results show that the larger the anisotropy ratio of soil strength is

the smaller the safety factor is. And with the increasing of internal frictional angle and the retaining wall insertion ratio

the safety factor will be enhanced significantly.