A Study Of Synthetical Analysis Method By Finite Element For Rock Slope Stability

The geotechnical engineering has a abiding interest in rock slopes stability analysis. Now there are a lot of rock slopes in China, especially in Three-Gorges project and development of western regions. As part of natural environment and terrain in which it works, or as a vital part of a building to be constructed above or below ground, natural rock slopes form the foundation of building, and the abutments of bridges and dams; artificial rock slopes which are products of excavation to creat space for transportation routes, building, powerhouse, dams, and portals and so on. For example, there are high slopes of There-Gorges shiplock, Llianziya dangerous rockmass and the others. It is necessary to enhance study work of rock slopes stability analysis.The paper presented a comparision of several method in common use in rock slopes stability analysis, and deduced the applicable analysis method for rock slopes in different work condition. The finite element method and limit equilibrium method are applied to rock slopes with one dominant discontinuity set at the same time, the influence on stability of rock slopes of different strength parameters of discontinuity surfaces is analysed by comparing the computed results; The stress curve is gained by simulating fracture in rock slopes with contact element and the selection of strength parameters of the slide surface is discussed. For some rock slopes, which have not distinct failure surface, but have complicated structure or load on the top and so on, a stability analysis of this type slopes by finite element method is presented, the failure surface is defined by certain rule or strain zone from the computed model, and then the safety factor of the rock slope is abtained by finite element method and limit equilibrium methodAt last, using ANSYS , a famous commercial finite element analysis software, a example of high-steep slope which is bearing the load of the LongGe Mansion is presented, the stability of this slope is studied, as a paradign the the stability evalution of complicated high-steep slope under the action of load of building , the chapter gives some meritable reference in stability assessment of rock slopes using numerical simulation by three-dimension elastic-plastic finite element.