RCC重力坝地质缺陷坝基处理方案优化及加固效果评价研究  

Study on Optimization of Foundation Treatment Scheme and Reinforcement Effect Evaluation of RCC Gravity Dam with Geological Defects

作　　者：黄静美 赵蕾蕾 谢红强[3] HUANG Jingmei;ZHAO Leilei;XIE Hongqiang(Chongqing Railway Investment Group Co., LTD, Jiangbei, Chongqing, 400423;Henan Water&Power Engineering Consulting Co., LTD, Zhengzhou, Henan, 450000;State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, Sichuan, 610006)

机构地区：[1]重庆铁路投资集团有限公司,重庆江北区400023 [2]河南省水利勘测设计研究有限公司,河南郑州450000 [3]四川大学,水力学与山区河流开发保护国家重点实验室,水利水电学院,四川成都61006

出　　处：《四川水力发电》2020年第3期80-84,共5页Sichuan Hydropower

摘　　要：笔者针对RCC重力坝地质缺陷坝基开展处理方案优化和评价研究,采用有限元超载法对碾压混凝土重力坝的坝基接触面应力、位移及坝体破坏进行分析。研究表明:随着超载系数的增大,坝基接触面上游部位的拉应力和下游部位的压应力均增大,且坝踵拉应力增长幅度大于坝趾压应力的增长幅度。同时,坝基竖向位移增大,坝踵与坝趾的位移差也随着超载系数的增大而增大。地基接触面位移量值增大及上下游变形差异的增大都会导致坝体塑性区的发育和扩展,不利于坝体的稳定性。基于不同地基处理方案下坝基位移、坝踵与坝趾位移差异性比较可知:地基处理方案四的加固效果较其他三种处理方案更能有效提高坝基的承载能力和稳定性。According to the geological defects of RCC gravity dam foundation,this paper researches the optimization and evaluation of foundation treatment scheme.The stress,displacement,and dam body damage of RCC gravity dam foundation contact surface is analyzed based on the finite element method and overload method.The results show that with the increase of overload coefficient,the tensile stress at upstream and the compressive stress at downstream of dam foundation contact surface increase,and the increase of tensile stress at dam heel is more significant than the growth of compressive stress at dam toe.At the same time,the vertical displacement of dam foundation and the displacement difference between dam heel and dam toe also increases with the increase of overload coefficient.The increase of displacement value of foundation contact surface and the difference of deformation between upstream and downstream will lead to development and propagation of the plastic area,which is not conducive to the stability of dam body.Based on the displacement of dam foundation,it is concluded that the reinforcement effect of the fourth foundation treatment scheme is better than other three treatment schemes,which can effectively improve the bearing capacity and stability of dam foundation.

关 键 词：坝基处理 超载法 地基缺陷 加固评价 

分 类 号：O474[理学—半导体物理] TV223.34[理学—物理]