Abstract：Based on the field investigation and the engineering geological exploration，the deformation failure characteristics of Jiangjunfen was analyzed. The changes of the stress field and the rules of the deformation failure of Jiangjunfen under three cases，the gravity field and the local soft foundation and the ground water seepage field，were researched respectively using FLAC technique. The simulation results show that the deformation failure mechanism of Jiangjunfen is a gradual developing process. Firstly，the whole structure of Jiangjunfen subsided into the local soft foundation，then leading to the decline of the northern part of the structure，accompanying with the tensile fracture among stones and the heaving of the groundsill，and at last resulting in the stones sliding and the large scale structure deformation failure of Jiangjunfen. It is helpful to evaluate the stability of Jiangjunfen and to adopt preventing measures to control the evolutional deformation of Jiangjunfen with the research conclusion.
