【摘要】 在土石坝坝坡模型振动台破坏试验基础上,采用数值分析方法,对坝坡的动力特性、稳定性以及加筋抗震措施的性能进行研究。采用动力弹塑性分析方法,对坝坡模型振动台试验进行数值仿真,通过类比计算工况,比较、分析坝坡的破坏过程及其破坏性态以及永久位移的变化规律;同时,采用拟静力方法对坝坡的稳定性进行分析,通过设定滑裂面参数,比较滑裂面的深浅,分析加筋对坝坡稳定性的影响,并与试验结果进行对比验证。结果表明:对模型进行的数值模拟和模型试验所得到的结果较为一致,表明坝顶是薄弱部分,破坏首先从坝顶附近开始,减缓坝坡或坝坡加筋均可减小坝坡的永久位移,但加筋能提高坝坡的整体稳定性,能有效控制坝坡的浅层滑动,且不增加大坝填筑量,与缓坡比较有较强的优势。该研究结果可为大坝的加筋抗震措施设计提供依据。更多还原

【Abstract】 The seismic stability of earth-rock dam is studied through shaking table test and numerical simulation.The dynamic behavior,failure mode,stability and reinforced performance of the soil dam slope during earthquakes are discussed.An elastoplastic analytical method is applied to simulating and analyzing the dynamic failure process of soil dam slope under earthquake.The permanent displacements of earth-rock dam in different cases are studied.In addition,the stability of dam slope,the depth of slip surface and the effectiveness of reinforcement are investigated by using the quasi-static method.The comparison between the calculated results and results obtained from shaking table tests shows that they are close and definitely verified each other.The study also shows that the top of dam is the vulnerable part;and cracks normally appear near this part under earthquake.The reinforcement and the gentle slope also can decrease the permanent displacement of dam slope.The reinforcement can obviously enhance the overall stability of dam without increasing the volume of the soil dam.The reinforcement has more advantages than the gentle slope.These studies provide basis for the design of the seismic measures of dam.更多还原