地表深井降水在胡麻岭隧道施工中的应用

Application of Surface Dewatering with Deep Well in Humaling Tunnel Construction

第三系泥质弱胶结富水粉细砂岩地质区段的胡麻岭隧道施工中,极易产生流砂、涌砂、稀糊状涌泥等现象,围岩水浸稳定性极差,造成施工受阻。采用地表深井超前降水技术,能有效改善隧道施工环境,减小地下水危害,降低施工难度和风险,加快施工进度。胡麻岭隧道3#斜井段200m地表深井降水施工方案对类似地质环境中隧道施工具有借鉴意义。

During the construction at Humaling tunnel, the section of the third series water-rich fine siltstonearea, it is easy to suffer from the quicksand, sand boil or thin paste sludge. So the construction is usuallyblocked due to the impact of the groundwater. Because of being disturbed by excavation, the surroundingrock＇s water logging stability is very poor. After the method of advanced surface dewatering with deep well isapplied, the tunnel construction environment is effectively improved. At the same time, the damages inducedby groundwater, constructional difficulty and risk are all reduced. On the contrary, the tunnel constructionschedule is speeded up. The surface dewatering construction scheme with 200m deep wells at the 3rd inclinedshaft gives some lessons for the other tunnel construction in the similar engineering-geological andhydrogeological environment.