Abstract:Based on GIS raster data model

the search method of the most dangerous three dimensional slope sliding surface with random search to determine the initial surface and pattern searh to determine the final surface was proposed.Combined with the search method

the program of slope stability with the analysis of 3D rigid body method was developed and verified by a numerical example to demonstrate the stability and rationality of program.The search illuminated that the search method not only avoided the situation that safety factor appears in local extremum in search progress of critical slip surface

but also improved the search efficiency of slip suerface and the program was highly accurate and stable.Furthermore

based on monitoring data of Shiziping Dam

the three dimensional stability analysis of the dam slope was carried out by the program.The search illuminated that the safety coefficient of dam slope was high under operating conditions and dam slope was in stable state.