Abstract:Aiming at the moraine soil slope in west wall of Taihe Iron Mine,a method based on the results of in-situ test and laboratory test for moraine soil which couples automata(CA) with FLAC3D to conduct triaxial simulation test is presented and shear strength model for moraine soil is established. Firstly,CA is adopted to simulate the microstructure of moraine soil and specimens are prepared for triaxial simulation test. Secondly,the simulation procedures of specimens are introduced into FLAC3D and then simulation tests are conducted. Finally,after the data from simulation results are processed,the probability models for shear strength are obtained. After that,a comprehensive analysis method of slope stability which integrates numerical analysis method,limit equilibrium method and reliability analysis method,is presented. In the comprehensive analysis method,three methods are linked to each other by adopting strength reduction technique,simplified first-order second-moment method and Rosenblueth method. The results of the three cases are interrelated consequently. According to the research results mentioned above,a multi-angle stability analysis of the moraine soil slope is made. The analyses of displacement vector and deformation indicate that the failure mode of the slope mainly exists as shallow circular shear failure. Although the mean factor of safety is high(1.40–1.59),the probability of failure(1.07%–3.36%) is high due to the higher uncertainty of shear strength parameters. As a result,the risk level of this slope is unacceptable so that some effective measures should be adopted.