蓄水位对山美土石坝地震动力响应的影响分析  

Influence of Water Level on Seismic Dynamic Response of Shanmei Earth Rock Dam

作　　者：陈锦祎 陈志波 谢永宁[2,3,4] 陈前 CHEN Jin-yi;CHEN Zhi-bo;XIE Yong-ning;Chen Qian(Department of Geotechnical and Geological Engineering,College of Environment and Resources,Fuzhou University,Fuzhou 350116,China;Fujian Provincial Universities Engineering Research Center of Geological Engineering,Fuzhou 350116,China;Key Laboratory of Geohazard Prevention of Hilly Mountains,Ministry of Natural Resources,Fuzhou 350116,Fujian Province,China;Department of Geotechnical and Geological Engineering,College of Zijin Geology and Mining,Fuzhou University,Fuzhou 350116,Fujian Province,China;Fujian Water Resources and Hydropower Research Institute,Fuzhou 350001,Fujian Province,China)

机构地区：[1]福州大学环境与资源学院岩土与地质工程系,福州350116 [2]地质工程福建省高校工程研究中心,福州350116 [3]自然资源部丘陵山地地质灾害防治重点实验室,福州350116 [4]福州大学紫金地质与矿业学院岩土与地质工程系,福州350116 [5]福建省水利水电科学研究院,福州350001

出　　处：《中国农村水利水电》2022年第2期155-162,共8页China Rural Water and Hydropower

基　　金：福建省水利厅科技计划项目(MSK201907)。

摘　　要：地震作用下土石坝的动力响应及其破坏模式一直是岩土工程界研究热点。采用FLAC有限差分软件分析山美土石坝在地震作用下产生的震后残余变形、加速度响应以及剪应变等情况,得到山美土石坝的普遍性动力响应规律。通过改变上游蓄水位高度,描述地震过程中坝内塑性剪应变区演变模式以及不同水位下震后坝内残余应变形态,发现山美土石坝率先发生剪应变集中部位一般是坝顶和坝坡的不同坝料交界处,一定震时后坝内剪应变形态基本不变,但剪应变量不断累积,此外逐渐抬高蓄水位会导致震后上游坝料中形成一条塑性不贯通剪切带。本次研究有助于理解地震作用下山美土石坝塑性剪应变区成因与形成过程,可对山美土石坝抗震工作提供重要参考。The dynamic response and failure mode of earth rockfill dam under earthquake is always a research hotspot in geotechnical engineering. FLAC finite difference software is used to analyze the residual deformation,acceleration response and shear strain of Shanmei earth rock dam after earthquake,and the general dynamic response law of Shanmei earth rock dam is obtained. By changing the upstream water level,the evolution mode of plastic shear strain area in the dam during the earthquake and the residual strain pattern in the dam after the earthquake at different water levels are described. It is found that the shear strain concentration position of Shanmei Earth Rock Dam is generally at the junction of different dam materials at the dam crest and dam slope. The shear strain pattern in the dam is basically unchanged after a stationary earthquake,but the shear strain is continuously accumulated,In addition,the gradual elevation of water level will lead to the formation of a plastic discontinuous shear zone in the upstream dam material after the earthquake. This study helps to understand the cause and formation process of plastic shear strain zone of Shanmei Earth Rock Dam under earthquake action,and can provide an important reference for the seismic work of Shanmei Earth Rock Dam.

关 键 词：蓄水位 动力响应 破坏形态 

分 类 号：TV641[水利工程—水利水电工程]