Abstract: Landslide, as a most frequently encountered geohazard, is critical to the accurate analysis of slope stability and to the geohazard prevention and mitigations. The conventional two-dimensional analysis methods could usually not to reflect the on-site stability status due to the actual topographical boundary constraints. This paper presents a refined three-dimensional numerical finite difference geological model by considering the actual topographic conditions, soil strata distribution, soil rock mass shear strength parameters as well as the construction sequence. The numerical model also considers the change of sliding direction and the side resistance surrounding the sliding body. The stability of the proposed soil/rock mass under different loading conditions and different improvement methods are evaluated and the optimized improvement method is therefore selected. 

Key words: landslide, slope stability, slope cut, finite difference methods