卵砾石深覆盖层堆石坝防渗体系的应力变形分布特征  

Stress and Deformation Distribution Characteristics of Impervious System of Rockfill Dam on Gravel Overburden

作　　者：朱强[1] 黄坤 胡俊强 ZHU Qiang;HUANG Kun;HU Jun-qiang(Changjiang Institute of Technology,Wuhan 430212,China;Pingdingshan Water Conservancy Survey andDesign Institute,Pingdingshan 467000,China;Shanshui Environment Technology CO.,LTD.,Xinxiang 453000,China)

机构地区：[1]长江工程职业技术学院,湖北武汉430212 [2]平顶山市水利勘测设计院,河南平顶山467000 [3]山水环境科技股份有限公司,河南新乡453000

出　　处：《浙江水利水电学院学报》2019年第4期10-16,共7页Journal of Zhejiang University of Water Resources and Electric Power

摘　　要：基于邓肯E—B非线性弹性模型,考虑了土体浸水湿化变形,引入比奥固结方程,建立了二维有限元模型,对深覆盖层基础上堆石坝防渗体系在不同工况下的应力变形进行分析,结果表明:心墙大主应力在80%墙体深度以下增加较快,明显存在“应力拱”现象;基础防渗墙蓄水期大小主应力均在70%墙体深度附近出现拐点,墙底上游面大主应力最小值6.58 MPa,易出现拉应力,而小主应力出现拉应力,水平位移在30%墙体深度附近出现最大值拐点值。The rockfill dam which is built on the deep cover of gravel layer has a higher requirement of impervious system,where the stress and deformation is complex and changeable.The stress and deformation characteristics of core wall under different conditions are studied,as well as the impervious wall of rockfill dam on deep alluvium.Considering the soil wetting deformation,two-dimensional finite element model was established based on Duncan E-B nonlinear elastic model and Biot consolidation equation.The results show that the major principal stress of the concrete core wall increases rapidly below the depth of 80%,forming the phenomenon of“stress arch”obviously.The vertical and horizontal strain is increased rapidly below the depth of 60%~70%.The principal stress of the cut-off wall has an inflection point at the depth of 70%during the storage period.When the minimum major principal stress is 6.58 MPa at the upper surface,tensile stress occurs easily.The maximum point of horizontal displacement is nearby on the wall depth of 30%.The research results can provide reference for the safe operation and design of the dam.

关 键 词：深覆盖层 防渗墙 应力变形 分布特征 

分 类 号：TV640.31[水利工程—水利水电工程]