【摘要】 冶勒大坝为沥青混凝土心墙堆石坝,最大坝高124.5 m,坝基地质条件复杂。该坝址距"5.12"汶川大地震震中约258 km,地震发生时坝区有强烈震感,大坝强震监测台阵获得了主震较为详细的地震记录。采用三维非线性动力有限元方法对冶勒大坝在"5.12"汶川地震主震作用下的动力反应进行分析。分析时,以基岩实测加速度时程作为地震动输入,最大峰值加速度为11.968g,持续时间为124.4 s。有限元动力计算结果与监测资料反映规律吻合较好,获得了冶勒大坝与一般土石坝不同的地震动力反应规律:大坝地震响应分布从左岸到右岸逐渐增大且横河向地震响应较大,这种特殊的反应规律与冶勒大坝左右岸基础严重不对称的特殊地质条件密切相关。更多还原

【Abstract】 Yele dam is a rockfill dam with an asphaltic concrete core.The maximum dam height is 124.5 m,and the geological conditions of its foundation are complex.The dam area with an epicentral distance of about 258 km was shocked strongly during Wenchuan Earthquake,and the monitoring station on the dam obtained records of the main earthquake.The 3D FEM nonlinear dynamic analysis was adopted to analyze the seismic response of the dam.and the recorded accelerogram on the bedrock was used as the input earthquake motion.It was found that the peak acceleration was 11.968 gal and the duration was 124.4 s.The analysis results were in good agreement with the actual seismic records,which were different from the common rockfill dam.The seismic response of the dam increased gradually from the left bank to the right bank,and the response in the longitudinal direction was comparatively large.The peculiar features of the dam’s seismic response were closely related to the special geological condition that the foundation of the dam was unsymmetrical seriously in the both bank.更多还原