两河口水电站高土石坝地震反应地震模拟振动台模型试验研究  

Model test study on dynamic response from high earth-rock fill dam of Lianghekou Hydropower Station with shaking table for seismic simulation

作　　者：陈宁[1] 杨正权[1] 袁林娟[1] 刘小生[1] 刘启旺[1] 杨玉生[1] 

机构地区：[1]中国水利水电科学研究院,北京100048

出　　处：《水利水电技术》2010年第10期80-86,共7页Water Resources and Hydropower 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(2009929);水利部公益性行业科研专项经费项目(200801133)

摘　　要：在大型地震模拟振动台上,进行了两河口水电站高土石坝地震模拟振动台模型试验。通过对模型坝在振动过程中的加速度反应的量测和分析、观察坝体在振动过程中的直接反应、量测坝体在振动后的永久位移和竖向沉降,得到了两河口高土石坝模型坝在地震中的加速度反应规律,地震残余变形及分布规律和坝体破坏过程及模式等。研究表明:空间位置、输入地震波强度和类型、先期振动和蓄水等因素对坝体各测点的加速度反应规律有重要影响。大坝在地震作用下的永久水平位移和竖向沉降很小;坝体的破坏形式主要是河谷段、靠近坝顶坝坡土体的颗粒松动,发生滚石而引起的浅层滑动。The model tests on the dynamic response from the high earth-rock fill dam of Lianghekou Hydropower Station were made with a large shaking table for seismic simulation. In the tests, the acceleration response characteristics of the model dam was obtained by the measurement and analysis to acceleration response of measure points in the model dam; the seismic residual deformation of the model dam was obtained by measurement to the displacement measure points on surface of the model dam after the earthquakes ; the dynamic failure process and mode of the model dam was obtained by direct ob- servation to the dynamic response of model dam in the earthquakes. The study shows that the acceleration response charac- teristics of the dam is greatly impacted by the factors i. e. the spatial location, type and intensity of input seismic wave, the early vibration, impoundment, etc. The seismic permanent horizontal displacement and vertical settlement are relatively less under the seismic effect, furthermore, the failure pattern of dam is the shallow sliding induce by the rock falling in the valley and on the slope near dam crest.

关 键 词：高土石坝 振动台模型试验 加速度反应 地震残余变形 破坏模式 两河口水电站 

分 类 号：TV32[水利工程—水工结构工程]