近断层脉冲型地震动对深厚覆盖层上高土石坝动力响应的影响研究  

Study on impact from near-fault pulse-like ground motion on dynamic response of high rockfill dam on deep overburden

作　　者：韩慧超 王志坚[3] 周晨光 孟涛 余翔[2] HAN Huichao;WANG Zhijian;ZHOU Chenguang;MENG Tao;YU Xiang(Key Laboratory of Failure Mechanism and Safety Control Techniques of Earth-rock Dam of the Ministry of Water Resources,Nanjing 210029,Jiangsu,China;School of Hydraulic Engineering,Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China;Xinjiang Xinhua Yarkant River Basin Water Resources and Hydropower Development Co.,Ltd.,Kashi 844000,Xinjiang,China)

机构地区：[1]水利部土石坝破坏机理与防控技术重点实验室,江苏南京210029 [2]大连理工大学建设工程学部水利工程学院,辽宁大连116024 [3]新疆新华叶尔羌河流域水利水电开发有限公司,新疆喀什844000

出　　处：《水利水电技术》2019年第3期79-84,共6页Water Resources and Hydropower Engineering

基　　金：水利部土石坝破坏机理与防控技术重点实验室开放研究基金(YK916005);国家重点研发计划资助(2017YFC0404900);国家自然科学基金项目(51779034;51678113);中央高校基本科研业务费资助(DUT17ZD219)

摘　　要：近年来,近断层地震动引起了工程界的密切关注,水工方面的相关研究主要集中在混凝土重力坝,对高土石坝的研究甚少,尤其是近断层脉冲型地震动的影响尚不明确。因此,结合我国西部强震区一些已建和拟建在深厚覆盖层上的高土石坝,开展脉冲型地震动对高土石坝抗震安全的影响研究是十分必要的。采用弹塑性本构模型进行有限元计算,对比分析脉冲型与非脉冲型地震动作用下大坝的动力响应。结果发现,脉冲型地震动对深厚覆盖层上高土石坝的加速度响应有一定影响,并使坝体在极短的持时内产生较大的坝体变形,不利于大坝安全。因此,建议在强震区、深厚覆盖层上修建高土石坝时,将近断层脉冲型地震动作用下的大坝抗震安全评价作为一个关键环节。In recent years, the near-fault ground motion draws great attention from engineering field, while the relevant researches in the aspect of hydraulic engineering are mainly concentrated on concrete dam, but the researches on high earth-rockfill dam is less, especially that the impact from the near-fault pulse-like ground motion is still not so definite. Therefore, it is necessary to carry out the study on the impact from the pulse-like ground motion on the seismic safety of earth-rockfill dam in combination with those constructed and proposed high earth-rockfill dams on deep overburden within the meizoseismal region in the West China. The dynamic responses of the dam under the pulse-like ground motion and the non-pulse-like ground motion are comparatively analyzed herein through finite element calculation made by the relevant elastoplastic constitutive model. The result finds out that the pulse-like ground motion has a certain impact on the acceleration response of the high earth-rockfill dam on deep overburden, and makes the dam body largely deformed in a very short period of time, which is unfavorable to the dam safety. Therefore, it is suggested that the assessment on the seismic safety of high earth-rockfill dam under the effect of near-fault pulse-like ground motion is to be taken as a key link when it is to be built on deep overburden within meizoseismal region.

关 键 词：近断层脉冲型地震动 深厚覆盖层 高土石坝 加速度响应 震后变形 

分 类 号：TU435[建筑科学—岩土工程]