摘要
水电站工程大坝、防渗墙、围堰和厂房基础均坐落在覆盖层之上,覆盖层存在不均匀沉降和渗透稳定的问题。文中在充分考虑坝区地质条件的基础上,采用三维有限单元法计算分析设置防渗墙后渗流场的渗流特性,并通过变换防渗墙的渗透系数,对于防渗墙的渗透性对整个渗流场的影响进行了较为深入的敏感性分析。计算结果表明在考虑防渗墙周围岩土的渗透性和确定防渗墙的长度和深度的基础上,合理确定防渗墙渗透系数尤为关键,以安全、经济地设置防渗系统。
For a hydropower station, dam, anti-seepage wall, cofferdam and workshop foundations are built above the overburden layer that has such problems as asymmetry subside and filter stabilization. By taking into full consideration of geologic conditions of the dam foundation, 3-D finite element method is used to calculate characteristics of seepage field around dam foundation on the left bank after building the anti-seepage wall, and sensitivity analysis is also made on how the wall＇ s permeability affects the whole seepage field through varying permeable coefficient of the wall. The calculation results indicate that, by taking into account of permeability of rock and soil around the wall and determining the wall＇s length and depth, reasonable permeability coefficient of the anti-seepage wall is crucial to set up an anti-seepage system safely and economically.
出处
《红水河》
2009年第4期96-99,共4页
Hongshui River
关键词
敏感性分析
覆盖层
防渗墙
渗流
sensitivity analysis
overburden layer
anti-seepage wall
seepage flow
