【摘要】 在高地震烈度区修建深厚覆盖层上的高土石坝面临许多问题,如大坝的动力稳定、坝基液化问题等,非常有必要对大坝的地震动力响应进行力学分析,以便为设计和施工提供指导。对瀑布沟大坝进行了三维地震动力响应有限元分析,就动力工况下芯墙、防渗墙的抗震能力及基础砂层的液化可能性等进行了研究,并提出了一系列针对坝体结构、材料等的优化措施。通过地震三维有限元分析,并采取一系列针对措施,坝体综合抗震能力得到了提高,可以满足有关规程规范要求,所得结论可以为类似工程提供参考和借鉴。更多还原

【Abstract】 To build high earth- rockfill dam on thick cover foundation in high earthquake intensity region will face many problems such as dynamic stability,dam foundation liquefaction etc. It is highly necessary to carry out dam’s seismic dynamic response to provide the guidance for design and construction of the dam. As an example,three-dimensional dynamic FEM was employed to analyze the seismic response of Pubugou corewall rockfill dam. The earthquake resistance capacity of corewall and seepage proof wall,and the liquefaction possibility of foundation sand layer were researched. According to the analysis results,some optimized measures for dam structure,material,and so on,were put forward to improve the seismic resistance of Pubugou corewall rockfill dam. The conclusions drawn in this paper can provide a reference to similar engineering.更多还原