基于非线性有限元法的面板堆石坝地震响应分析  

Seismic response analysis of concrete face rockfill dam based on nonlinear finite element method

作　　者：沙成刚 万英正 SHA Chenggang;WAN Yingzheng(Qinghai Water Resources and Hydropower Survey,Planning and Design Institute Co.,Ltd.,Xining 810001,China)

机构地区：[1]青海省水利水电勘测规划设计研究院有限公司,青海西宁810001

出　　处：《水利建设与管理》2023年第6期13-19,共7页Water Conservancy Construction and Management

基　　金：国家自然科学基金(51969026)。

摘　　要：为研究面板堆石坝在地震荷载下的破坏程度和抗震能力,依据面板坝设计理论和莫尔-库仑准则,通过建立三维模型,采用非线性有限元数值计算的方法对夕昌水库面板坝进行地震响应分析计算,以掌握坝体与面板位移变形及应力分布规律,并定量分析坝体与面板的位移和应力变化及周边缝和垂直缝变位幅度等。结果表明,随着Ks取值增大,坝体最大断面堆石体竖向位移和面板位移均有较大增长,面板从两岸向坝中逐渐向坝体内凹进,呈微半圆弧状且基本对称分布。同时,堆石体的大小主应力在地震波作用下增长幅度不大,说明地震响应对堆石体竖向和水平位移影响很小;而面板的顺坡向正应力和轴向拉应力在地震波作用下随之增大,说明地震响应对面板的坝轴向正应力影响较大。从计算结果可看出,选取的模量系数是否合适,是取得较真实、较合理计算结果的关键。In order to study the damage degree and seismic capacity of concrete face rockfill dams under seismic loads,based on the design theory of face rockfill dams and the Mohr-Coulomb criterion,a three-dimensional model is established and nonlinear finite element numerical calculation is used to analyze the seismic response of Xichang Reservoir face rockfill dam.It aims to understand the displacement deformation and stress distribution of the dam body and panel,and to quantitatively analyze the displacement and stress changes of the dam body and panel,as well as the displacement amplitudes of the surrounding seams and vertical seams.The results show that as the value ofKsincreases,the vertical displacement of the largest cross section of the dam body and the displacement of the panel both increase significantly.The panel gradually concaves inward from both sides to the inside of the dam body,presenting a slightly semi-circular and basically symmetrical distribution.At the same time,the magnitude of the principal stress of the rockfill body does not increase much under the action of the earthquake wave,indicating that the earthquake response has little effect on the vertical and horizontal displacement of the rockfill body.However,the normal stress and axial tensile stress in the downstream direction of the panel increase under the action of the earthquake wave,indicating that the earthquake response has a greater impact on the normal stress in the axial direction of the panel.From the calculation results,it can be seen that the appropriate selection of the modulus coefficient is the key to obtaining more realistic and reasonable calculation results.

关 键 词：面板堆石坝 地震响应 应力 变位 

分 类 号：TV314[水利工程—水工结构工程]