考虑库底吸收的高拱坝地震响应影响研究  

Study on the influence of seismic response of high arch dams considering reservoir bottom absorption

作　　者：陈灯红[1,2] 岳梦 林天成 CHEN Denghong;YUE Meng;LIN Tiancheng(Hubei Key Laboratory of Disaster Prevention and Mitigation,China Three Gorges University,Yichang 443002,China;College of Civil Engineering and Architecture,China Three Gorges University,Yichang 443002,China)

机构地区：[1]防灾减灾湖北省重点实验室(三峡大学),湖北宜昌443002 [2]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《地震工程与工程振动》2024年第6期173-184,共12页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(52079072);土木工程防灾减灾湖北省引智创新示范基地(2021EJD026)。

摘　　要：考虑了库水的可压缩性与库底淤泥对结构地震响应的影响,以锦屏一级高拱坝为例,建立高拱坝-库水-地基系统模型,通过与Westergaard方法计算的动水压力进行对比,验证使用声固耦合方法模拟库水对坝体作用的可行性。同时,通过模型中设置的不同库底反射系数来模拟上游水库库底沉积淤泥的吸收作用,依据场地条件选取符合水工规范反应谱的地震记录作为输入,探究不同反射系数下大坝在不同库底反射系数垂直入射地震作用下的拱冠梁处动水压力等响应值。研究结果表明:库底反射系数的大小对拱冠梁处的动水压力结果具有明显影响,动水压力响应值随着反射系数增大而增加,相邻反射系数下坝踵处动水压力的差值随之变大。The compressibility of reservoir water and the influence of reservoir-bottom silt on the seismic response of the structure are taken into account to establish the high arch dam-reservoir water-foundation system model of Jinping-I Arch Dam,and the feasibility of using the acoustic-solid coupling method to simulate the effect of reservoir water on the dam body is verified by comparing it with the dynamic water pressure calculated by the Westergaard method.The absorption of silt deposited at the bottom of the upstream reservoir is simulated by different reflection coefficients of the reservoir bottom set in the model;seismic records that conformed to the hydraulic code response spectrum were selected as input based on the site conditions,and the response values of dynamic water pressure at the arch crown beam of the concrete dam under the action of vertical-incidence earthquakes with different bottom reflection coefficients were analyzed and studied.The results showed that the magnitude of the bottom reflection coefficient has a significant effect on the dynamic water pressure results at the arch crown beam,and the dynamic water pressure results increase with the increase of the reflection coefficient,and the difference of the dynamic water pressure at the heel of the dam with adjacent reflection coefficients becomes larger.

关 键 词：库底吸收 库底反射系数 动水压力 地震响应 

分 类 号：TV312[水利工程—水工结构工程]