Research on seismic response of soil-rock mixture slope based on added mass

Based on added mass method, using the powerful function of secondary development of ABAQUS, the stability of a soil-rock mixture slope on the left bank of Liyuan hydropower station on midstream Jinsha River is analyzed under the condition of earthquake after impounding. The results show that: (1) during the whole process of earthquake, both the value and the direction of the moving velocity of geomaterial change sharply, and this kind of repetitive variation may be one of important reasons that geological bodies loose their stability; (2) the enormous seismic shock wave makes shallow part of the slope mass move outside, but the motion direction of geomaterial under water level is mainly horizontal while other parts mainly move in vertical direction because of the reservoir water pressure; and (3) although the slope shows different plastic yields under seismic condition, continuous plastic zone does not come into being. So it can be inferred that the slope still keeps stable under seismic condition.