坝基混凝土防渗墙应力变形三维有限元分析  

3D Finite Element Analysis of Stress and Deformation of Concrete Cut-off Wall in Dam Foundation

作　　者：祁伟强[1] 彭云枫[1] 袁玉琳[1] 郝丹[1] 李秀文[1] 

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002

出　　处：《水电能源科学》2012年第8期63-66,共4页Water Resources and Power

基　　金：三峡大学科研创新基金资助项目(2011CX007)

摘　　要：为研究不同连接型式下基岩强度对混凝土防渗墙应力变形的影响,结合巴拉水电站土石坝混凝土防渗墙对坝体和防渗墙的应力变形进行二维和三维有限元方法计算,揭示了防渗墙应力变形随主要影响因素变化的规律,并分析了不同连接型式、不同强度的基岩对混凝土防渗墙墙体变形和应力的影响。结果表明,对防渗墙进行数值模拟时,设置有厚度节理单元可较好地模拟墙体两侧的"泥皮",结果较合理;基岩强度较高时,防渗墙和基础的连接方式对防渗墙应力变形的结果影响较大;进行三维模拟能更准确地反映防渗墙的应力变形特征。To study the influence of bedrock strength on stress and deformation of concrete cut-off wall with different constrain types, this paper calculates the stress and deformation of dam and cut-off wall by using 2D and 3D finite element methods based on the cut-off wall in earth rock dam of Bala Hydropower Project. And the variation rules of the stress and deformation of the cut-off wall along with main influencing factors are revealed. Then the influences of the stress and de formation of the cut-off wall with different wall constrain types and bedrock strength are analyzed. The results show that it is more reasonable for numerical simulation of cut-off wall to set joint elements with thickness between different materials, which can simulate the mud skin better on both sides of the wall; the higher the bedrock strength is, the greater the influences of different joint types on the stress and deformation of the cut off wall will be; for reflecting the characteristics of the stress and deformation of the cut-off wall more accurate, it is necessary to conduct 3D simulation in the process of numerical simulation on earth dam.

关 键 词：防渗墙 节理单元 有限元分析 应力变形 土石坝 

分 类 号：TV223.42[水利工程—水工结构工程]