增设水垫塘对坝基扬压力影响的数值分析  

NUMERICAL COMPUTATION AND ANALYSIS OF INFLUENCE OF PLUNGE POOL CONSTRUCTION ON UPLIFT PRESSURE OF DAM FOUNDATION

作　　者：李守巨[1] 刘迎曦[1] 李华[2] 吴凤吉[2] 

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室,大连116024 [2]白山发电厂,吉林132400

出　　处：《岩石力学与工程学报》2003年第1期86-89,共4页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金(10072014);工业装备结构分析国家重点实验室开放基金(GZ9908)资助项目。

摘　　要：根据岩石渗透系数反演结果,采用三维渗流有限元方法分析了白山水电站水垫塘增设后在4种不同上下游水位条件下坝基扬压力的变化。数值计算表明,在水垫塘排水系统有效情况下,水垫塘不会引起坝基扬压力的增加;当水垫塘排水系统失效时,如果不在护底处设置排水孔将会引起坝基扬压力的增加。根据有限元渗流场计算结果,提出了降低坝基扬压力的技术措施。Based upon the observed data of uplift pressure and prior information of pouring water test in Baishan hydraulic power station, the permeability coefficients of rock and concrete are identified by making use of neural networks. According to the inversion results of permeability coefficients, the changes of the uplift pressure are researched by three-dimensional FEM under the four different loading cases after the plunge pool excavation. The computation results testify that the construction of plunge pool will not increase the uplift pressure while the drainage system of plunge pool is effective. The construction of plunge pool will increase the uplift pressure while the drainage system of plunge pool is invalid. The technological measures of reducing uplift pressure have been taken for the dam foundation with high uplift pressure based on the calculation result.

关 键 词：水垫塘 坝基 扬压力 渗透系数 排水孔 水工结构 

分 类 号：TV223.6[水利工程—水工结构工程]