混凝土重力坝动力抗滑稳定性分析

Dynamic Sliding Stability Analysis of Concrete Gravity Dam

地震作用下,动力抗滑稳定性分析是大坝抗震安全评价的重要组成部分。文章依托某碾压混凝土坝实际工程,建立坝体-库水-地基多耦合仿真模型。在正常蓄水位工设计况下,采用等效一致人工边界模拟坝体-地基动力耦合作用,计算模型在地震作用下典型坝段的地震响应。采用剪力比例法对地震作用下岸坡坝段的动力抗滑稳定进行分析研究。结果表明,坝体最大位移响应出现在上游坝顶处位置,最大拉应力和压应力分别呈现在坝踵和坝趾处位置,大坝动力稳定计算满足抗震规范要求。

Dynamic anti-sliding stability analysis is an important part of seismic safety evaluation of DAMS under earthquake action.Based on a RCC dam project,a multi-coupling simulation model of dam body,reservoir water and foundation is established in this paper.The equivalent uniform artificial boundary is used to simulate the dynamic coupling between dam and foundation under the design of normal reservoir level,and the seismic response of typical dam section under the seismic action is calculated.The shear ratio method is used to analyze the dynamic anti-sliding stability of bank slope dam section under earthquake action.The results show that the maximum displacement response of the dam body occurs at the top of the upstream surface,the maximum tensile stress and compressive stress occur at the heel and toe of the dam,respectively.The stability calculation of the dam meets the requirement of anti-sliding stability.