深厚覆盖层上高土石坝动力稳定分析  

Study on the Dynamic Stability Analysis Method for High Earth Built on Deep Overburden

作　　者：邹德高[1] 余翔 余挺 闫生存 王锋 ZOU Degao;YU Xiang;YU Ting;Yan Shengcun;WANG Feng(School of Hydraulic Engineering,Dalian University of Technology,Dalian 116024,China;School of Water Conservancy Engineering,Zhengzhou University,Zhengzhou 450001,China;Power China Chengdu Engineering Corporation Limited,Chengdu 610072,China;Sichua Huaneng Luding Hydropower Co.,Ltd.,Chengdu 610041,China)

机构地区：[1]大连理工大学水利工程学院,辽宁省大连市116024 [2]郑州大学水利科学与工程学院,河南省郑州市450001 [3]中国电建集团成都勘测设计研究院有限公司,四川省成都市610072 [4]四川华能泸定水电有限公司,四川省成都市610041

出　　处：《水电与抽水蓄能》2020年第1期22-27,共6页Hydropower and Pumped Storage

基　　金：国家自然科学基金(U1965206);中央高校基金科研业务费资助(DUT19ZD216);华能集团科技项目资助(HNKJ18-H25)。

摘　　要：直接在覆盖层上修筑土石坝已成为我国西部强震区开发水能资源的常用形式,大坝抗震安全问题至关重要且备受关注,但有关深厚覆盖层上高土石坝的研究仍缺少针对性深入分析.本文采用自主研发的分析软件,计算了超深覆盖层上高土质心墙坝在地震作用下的坝坡稳定性,其中计算地震惯性力的加速度分布分别采用规范建议值和有限元动力反应结果.结果表明:规范建议的加速度分布无法反映大坝-深厚覆盖层体系动力反应特性,很难合理评价土石坝的抗滑稳定性.基于有限元动力反应分析的加速度分布较好地考虑了深厚覆盖层效应,反映了地震作用下大坝体系的关键特性,可合理描述动力稳定分析中的地震惯性力,从而获得更准确的稳定分析结果.Building earth dam directly on the overburden has become a common form of developing hydropower resources in strong earthquake regions of western China,dam seismic safety is critical important and attracted most attention,but the research on the high earth dam built on the deep overburden still lacks of targeted and in-depth analysis.In this paper,the dam slope stability of a high earth core dam to be built on an ultra-deep overburden under earthquake is analyzed using the self-developed software.The quasi-static stability analyses of the dam slope are studied with the acceleration distribution suggested by the standard and from FE dynamic analysis respectively.The results indicate that the acceleration distribution recommended by the standard cannot reflect the dynamic response characteristics of the dam-foundation system,it is difficult to reasonably evaluate the anti-sliding stability of the earth dam.The effect of deep overburden is considered good in finite element dynamic analysis,the acceleration distribution can reflect the key characteristics of the dam system under earthquakes and describe the sliding force in dynamic stability analysis,so that more accurate stability analysis results are obtained.

关 键 词：覆盖层 土石坝 稳定 拟静力 有限元动力分析 

分 类 号：TV641[水利工程—水利水电工程]