近断层脉冲型地震动作用下面板堆石坝的动力响应  

Seismic response of a concrete-faced rockfill dam to near-fault pulse-like ground motions

作　　者：邹德高[1,2] 韩慧超[1,2] 孔宪京[1,2] 周扬[1,2] ZOU Degao HAN Huichao KONG Xianjing ZHOU Yang(State Key Laboratory of Coastal ＆ Offshore Engineering, Dalian University of Technology, Dalian 116024, China School of Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China)

机构地区：[1]大连理工大学海岸和近海工程国家重点试验室,辽宁大连116024 [2]大连理工大学水利工程学院,辽宁大连116024

出　　处：《水利学报》2017年第1期78-85,共8页Journal of Hydraulic Engineering

基　　金：国家自然科学基金项目(51379028;51279025;51508071);新世纪优秀人才支持计划项目(NCET-12-0083)

摘　　要：越来越多的高土石坝正在西部地区建设或规划中,其中许多位于发震断裂带附近,遭遇近场强震的概率随着大坝数量的增加而增加,近断层脉冲型地震动作用下大坝地震响应特性亟待研究。本文选取10组台湾集集地震实测加速度时程,结合200 m级的面板堆石坝开展动力有限元分析,研究脉冲和非脉冲地震动作用对面板堆石坝的加速度、水平位移以及面板顺坡向应力的影响。结果表明,与非脉冲型地震动相比,脉冲型地震动对大坝堆石体的水平位移和面板顺坡向应力的影响较大,影响程度随着PGV/PGA(地面峰值速度/地面峰值加速度)的增大而增大。因此,在高地震区修建高土石坝时应对脉冲型地震进行专门研究,综合评价大坝的地震安全性和极限抗震能力。An increasing number of high rockfill dams are constructed and planned in the western region,and most of them are situated near the seismic fracture belt. With the increase of high dams,the probabili-ty of encountering near-field earthquake is increased, and the seismic response of dams to near-fieldground motions should be studied urgently. In this paper, ten near-fault ground motions are selected fromJiji Earthquake occurred in Taiwan, and the numerical results of the dam under two types（pulse-like andnon-pule） of earthquake records are compared, including acceleration, horizontal displacement of the rock-fill and lop-direction tensile stress of the concrete face slab of concrete-faced rockfill dam（CFRD）. It ispointed out that horizontal displacement of the rockfill and lop-direction tensile stresses to pulse-likenear-fault ground motions are significantly greater than that to non-pulse ground motions. Meanwhile,pulse-like effect grow along with the increase of PGV/PGA（peak ground velocity/peak ground acceleration）.Therefore,the special research should be done on the seismic response of a concrete-faced rockfill dam topule-like ground motions. It is necessary to evaluate comprehensively the security and ultimate aseismic ca-pacity of rockfill dams.

关 键 词：近断层 脉冲型地震动 面板堆石坝 地震动响应 

分 类 号：TV312[水利工程—水工结构工程]