锦屏二级水电站高埋深隧洞地下水处理技术

Groundwater treatment technology for deep buried tunnels at JinpingⅡHydropower Station

锦屏二级水电站深埋长隧洞群平均埋深达到1500~2000 m,地应力高,工程地质条件复杂,此地质条件下地下水处理施工较为困难。为解决以上问题,本工程地下水处理采取分阶段进行,即先对出水洞段进行勘察,然后表面封堵小流量及次大流量的出水点、段,再深层加固围岩,形成一定厚度的均一防渗固结圈,最后对集中涌水点进行封堵。处理后各项检查结果均满足合格标准,达到了预期的处理效果。

The deep-buried long tunnel group at JinpingⅡHydropower Station has an average buried depth of 1500~2000m with high stress and complex engineering geological conditions which lead to difficult groundwater treatment.Groundwater treatment for this project was done in stages.First,survey was performed for the outlet tunnel section;then,the outlet points and sections with small flow and sub-large flow were blocked on the surface,and the deep surrounding rock was reinforced to form a uniform anti-seepage consolidated ring of some thickness;finally,the concentrated water gushing point was sealed off.After treatment,the inspection results all met the standard and achieved the expected treatment effect.