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论文类型：会议论文

发表时间：2006-01-01

收录刊物：CPCI-S

页面范围：263-268

关键字：high earth-rock dams; acceleration distribution; strength reduction technique; stability analysis

摘要：The seismic coefficient suggested in the current Specifications for Seismic Design of Hydraulic Structures (DL5073-1997) is suitable for earth-rock dams lower than 150m. While at the present time, many earth-rock dams being designed are higher than 150m. Compared with low dams, high dams get less constraint from stiffness of foundation, and its self-vibrating period becomes prolonged. During the seismic response, high order self-vibrating period gets more opportunities to coincide with the seismic predominant period, and high order vibrations are easily to be activated and amplified, which result in the seismic acceleration distribution is somewhat different from low dams. With finite element method, the seismic acceleration distribution of high earth-rock dams is analyzed. The suggested figure of the seismic coefficient of earth-rock dams 250m-level in height is put forward. Based on the above analysis, with strength reduction technique, further research of the slope seismic stability analysis of earth-rock dams 250m-level in height is made. The conclusion is with the decrease of the seismic coefficient in the dam body, the critical value of safety factor of the dam slope increases.