某RCC抽水蓄能电站重力坝设计和三维全坝段抗震安全研究  

Design of RCC Gravity Dam and Seismic Safety Study of 3D Full Dam Section for A Pumped-Storage Hydropower Project

作　　者：王伟 梁辉 周兰生 董翌为 郭胜山 WANG Wei;LIANG Hui;ZHOU Lansheng;DONG Yiwei;GUO Shengshan(PowerChina Northwest Engineering Corporation Limited, Xi'an 710065,China;China Institute of Water Resources and Hydropower Research, Beijing 100048,China)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,西安710065 [2]中国水利水电科学研究院,北京100048

出　　处：《西北水电》2022年第3期70-79,共10页Northwest Hydropower

基　　金：国家自然科学基金面上项目(51979292).

摘　　要：RCC坝(Roller compacted concrete dam)的设计应根据各部位功能需求和设计条件,因地制宜的布置,亦应体现RCC坝技术的发展。针对某抽水蓄能电站下库RCC大坝,在设计过程中改变了大坝断面的结构尺寸及横缝间距,采用了“全面碾压混凝土”筑坝技术,调整了坝内其它一些结构布置。依据设计方案,构建了大坝三维全坝段有限元模型,以粘弹性人工边界模拟无限地震的辐射阻尼效应,以动接触力模型模拟各类接触缝面的动力接触非线性影响,分别对运行基准地震(OBE,Operational basis earthquake)和最大可信地震(MCE,Maximum credible earthquake)作用下的抗震安全进行了全面地评估和研究,对OBE下坝体位移、应力和抗滑稳定进行了评价,对比分析了5组MCE地震波作用下坝体横缝、碾压层面以及坝基交界面处张开和滑移。结果表明,尽管MCE作用下大坝出现了局部非线性损伤变形,但其震后仍可保持稳定和正常的挡水功能,不致出现库水失控下泄的灾变风险。The design of RCC dam should be based on the functional requirements and design conditions of each section,and the layout should be adapted to local conditions,and should also reflect the development of RCC dam technology.The RCC dam in the lower reservoir of a pumped-storage hydropower project is discussed in this paper.During the design process,according to the change of design conditions,the structural size of the dam section and the spacing of the transverse joints are changed;the"comprehensive roller compacted concrete"dam construction technology is adopted and the layout of other structures in the dam is also modified.According to the design scheme,a 3D finite element model of the full dam section is constructed.The viscoelastic artificial boundary is used to simulate the radiation damping effect of infinite earthquakes,and the dynamic contact force model is used to simulate the dynamic contact nonlinear effects of various contact joint surfaces.The seismic safety under the action of operational basis earthquake(OBE)and maximum credible earthquake(MCE)has been comprehensively evaluated and studied;The displacement,stress and anti-sliding stability of the dam under OBE are analyzed and evaluated;The opening and sliding of transverse joints,rolling layers and dam foundation interfaces of the dam body under the action of five groups of MCE seismic waves are compared and analyzed.The results show that,despite the local nonlinear damage and deformation of the dam under the action of MCE,the dam can still maintain a stable and normal water retaining function after the earthquake,and there is no catastrophe risk of uncontrolled reservoir water leakage.

关 键 词：RCC重力坝设计 三维全坝段 接触非线性 张开和滑移 抗震安全 

分 类 号：P49[天文地球—大气科学及气象学]