地震作用下的两河口高土石坝地震残余变形和破坏振动台模型试验研究  

Study on shaking table model tests of seismic residual deformation and failure for Lianghekou high rock-fill dam

作　　者：杨正权[1] 刘小生[1] 陈宁[1] 袁林娟[2] 汪小刚[1] 刘启旺[1] 杨玉生[1] 洪桂标[2] 

机构地区：[1]中国水利水电科学研究院,北京100048 [2]中国农业大学,北京100083

出　　处：《水力发电学报》2011年第3期152-157,共6页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金委员会和二滩公司雅砻江联合基金项目(50639060);水利部"948"创新项目(200929);水利部公益性行业科研专项经费项目(200801133);"十一.五"国家科技支撑计划项目(2009BAK56B02)

摘　　要：由于目前高土石坝强震记录资料缺乏和其它试验技术的局限性,土石坝的地震模拟振动台模型试验仍是当前研究大坝结构地震残余变形特性和破坏机理的重要手段。本文利用大型振动台模型试验,研究两河口高土石坝模型坝的地震残余变形特性和在强烈地震作用下的破坏过程和状态,并类推分析原型高土石坝的地震残余变形规律和动力破坏模式。试验结果表明:地震作用下,心墙堆石坝的地震残余变形相对较小;坝体动力破坏的形式主要是河谷段、靠近坝顶坝坡的散粒体滑移和浅层滑动;多维地震动,对坝体的地震残余变形控制和动力稳定不利。基于试验结果和分析,建议在高土石坝抗震设计中,加强对河床坝段坝顶区的保护。Shaking table model test is the major technique to study the seismic responses of a high rock-fill dam because of the shortage in actual earthquake measurement data and the limitation of other test techniques.In this work,a large-scale model was tested to analyze the seismic residual deformation and dynamic failure mode of a high rock-fill dam under the conditions of extremely strong earthquake,and some responses of the prototype dam were predicted.The test results show that the core rock-fill dam has relatively smaller residual deformation and that the major failure patterns are featured by rocks rolling and surface-layer sliding on the dam slopes near the river channel.Multi-dimensional earthquake is an unfavorable factor to the control of residual deformation and dynamic stability.This study suggests that the protection of dam top area should be strengthened in anti-seismic design of rock-fill dam.

关 键 词：水工结构 地震残余变形 振动台模型试验 高土石坝 动力破坏 抗震设计 

分 类 号：TV323[水利工程—水工结构工程]