引黄工程北干线支北01号隧洞段工程地质,水文地质问题分析

北干线０１＃隧洞段开工以来，隧洞涌水量大一直困扰着施工的顺利进行。结合前期勘察资料、施工地质编录资料以及施工现场多次调查，认为１＃、２＃斜井近年来该区域地下水位抬升，三个断层带涌水是造成１＃、２＃斜井开挖洞段被淹的主要原因。并提出在地下水比较丰富的洞段，应遵循开挖后紧跟衬砌，必要时对隧洞围岩进行灌浆，在大量涌水的断裂构造带，应进行超前探测，必要时进行超前灌浆封堵措施等建议。

Analysis on Engineering Geological and Geohydrological Problems in the No.1 Tunnel Section of the North Branch of the North Main Line

The great water gushing has always hindered the construction of the No.1 tunnel section of the north branch,the North Main Line.According to the antecedent investigation data,recorded geological data in course of construction,and on site survey done at many times,the author thought that the main cause which leads the excavated section of No.1 and No.2 inclined shafts to be submerged is the rising of regional ground water level and the water gushing in three fault zones.The suggestions that the lining should be made following closely the excavation,if necessary,the adjoining rock of tunnels should be grouted in the tunnel section with relative abundance of underground water,and suggestions that the leading exploration,if necessary,the leading anchor grouting should be done in the fracture zone having great water gushing are proposed.