Stability Evaluation Of Bank Rock Slope On A Key Rail Way Bridge In Yunnan Province

One railway in YunNan is one of the heavy, big, difficult key projects which China is planning and constructing. The line section between A city and B city will cross over the transitional zone in south-eastern tibetan plateau and yunnan-guizhou plateau. Here, the topography composed by crustal deformation, the regional geology caused by neotectonic activity and the geological disasters formed by fault activities, are all new problems faced with global engineering geology fields. Therefore, it is very necessary to carry out specific geological exploration and evaluation on the hing pier and long-span Bridges as well as the stability of high steep slope.Based on the investigation of engineering geological conditions of the bridge site area, this paper carries out the prediction research on the existing and potential landslide. Through the research on the drilling core in the bridge site area, this paper gives the potential sliding surface of landslide and determines the geological mode, then this paper carries out calculation and analysis on the stability of the potential sliding surface with the limit equilibrium method-Sarma and obtains the safety factors under each dewatering rate. With FEM, this paper calculates the stress and strain of the slope in such conditions as natural, loaded, earthquake and reservoir impoundment and judges the condition of slope failure. With discrete element software-UDEC, this paper gives the displacement calculation and analysis of bank stability. In the end, this paper comes to a conclusion of the bank slope stability through the comparison of the above three methods.