基于动力离心试验的软基尾矿库地震响应研究  

Characterization of the seismic behavior of tailings reservoir founded on soft soil using dynamic centrifuge tests

作　　者：张雪东[1] 蔡红[1] 魏迎奇[1] 张紫涛 梁建辉[1] 胡晶[1] ZHANG Xue-dong;CAI Hong;WEI Ying-qi;ZHANG Zi-tao;LIANG Jian-hui;HU Jing(State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research,Beijing 100038,China)

机构地区：[1]中国水利水电科学研究院,流域水循环模拟与调控国家重点实验室,北京100038

出　　处：《岩土力学》2020年第4期1287-1294,1304,共9页Rock and Soil Mechanics

基　　金：国家重点研发计划项目(No.SQ2017YFSF060085);国家自然科学基金(No.51809290);中国水科院基本科研业务费专项(No.GE0145B102017)。

摘　　要：基于离心机振动台,分别针对典型软基尾黏土尾矿库及加高扩容后的尾矿库开展了动力离心模型试验,重点探究了加速度分布规律、软土及尾矿内部孔压变化规律以及"软基-库内尾矿-尾矿坝"系统的变形规律等内容。试验结果表明:软基对地震动的放大效应较为微弱,而坝体加速度沿高程逐渐放大,高层子坝加速度响应最为强烈,加高扩容后的现坝顶加速度响应可达原坝顶的2.2倍;地震作用下软土与库内尾矿内部均会产生一定的孔压增量,但未达到液化状态。地震动强度、软基及库内尾矿的固结状态对尾矿库的变形模式影响较大。当固结不充分时,在强震作用下易发生尾矿的水平滑移,进而造成坝顶及下游软土隆起。在固结较为充分且地震动强度较弱的情况下,变形模式以震陷为主。该试验成果将为此类尾矿库的动力稳定分析及抗震加固设计提供一定参考。A series of dynamic centrifuge model tests on clay tailings reservoir as well as the reservoir after expanding has been performed in a centrifuge shaker.The seismic behavior examined in this study includes the acceleration amplification,variations in the pore water pressure both in soft clay foundation and in clay tailing,deformation of the soft ground-clay tailing-tailings dam system.The experimental results indicate that the acceleration amplification by the soft clay ground is limited,while the acceleration response increases with height for the tailings dam.The strongest acceleration response occurs at the highest sub-dam,especially at the highest one of the tailings dam after expanding.There is an increase in pore water pressure induced by earthquake both in soft ground and in clay tailing,but no liquefaction occurs.The ground motion,soft foundation and the consolidation state of tailings in the reservoir have great influence on the deformation mode of tailings reservoir.If the soil is not sufficiently consolidated and the earthquake is strong enough,horizontal movement of the clay tailing and rise of soft clay in the downstream can occur.Seismic settlement can be found if the soil is sufficiently consolidated and the shaking is relatively weak.The experimental results can provide a reference for the seismic analysis of this kind of tailings reservoir.

关 键 词：动力离心试验 软土 尾黏土 尾矿库 地震响应 

分 类 号：TU435[建筑科学—岩土工程]