庙埂隧道浅埋段地下水渗漏原因分析及处理措施

Cause Analysis and Treatment Measures of Groundwater Leakage at Miaogeng Tunnel Shallow-buried Section

在建成都至贵阳铁路庙埂隧道进口长浅埋段,地表分布两个村庄。隧道开挖发生地下水渗漏,对地下水环境造成了破坏,致使地表井泉点干枯或水量减少,直接影响约680人的生产生活用水。为此,通过对庙埂隧道进口段大范围的水文地质调查,包括地下水含水岩组、补径排特征分析,并收集了施工段洞内及地表漏水现状资料,分析漏、失水原因,并提出"以堵为主,限量排放"的处理原则,采用洞内径向注浆结合超前周边注浆措施,达到堵水的效果,缓慢恢复了地下水环境。

Two villages are located in the long shallow-buried section at the entrance of Miaogeng Tunnel of Chengdu--Guiyang Railway under construction. The underground water leakage caused in the evacuation of the tunnel leads to well water or spring reduced, and due to damage to the groundwater environment, the life and production of about 680 local people are directly affected. The causes for water leakage and loss are analyzed by extensive hydrogeology survey around the entrance section of Miaogeng Tunnel, including analysis of aquifers and groundwater recharge runoff characteristics, and collections of the current situation of cave water and surface water leakage. The principle of ＂leakage stoppage first and discharge limitation＂ is proposed and a combined measure of radial grouting in cave and advanced peripheral grouting is taken to detain the water and slowly recover the groundwater environment.