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该隧硐工程位于南口东北虎峪村附近。区内的地质构造情况如图1所示。构造线以北东方向为主,其次为北北西方向。区域性规模较大的虎峪断裂(F_1)位于工程区东南,走向北东,倾向南东,倾角40°,断层角砾岩厚达上百米。从破裂面的不规则形状及出露很厚的角砾岩来看属张性结构面。此外,工程区内还存在有雀涧断裂(F_(Ⅱ)),马连滩断裂(F_(Ⅲ))。前者位于隧硐南部,走向东西倾向南,断层角砾岩厚数十米,角砾岩由灰岩组成,胶结良好,属张性断裂,为虎峪断裂的分支,两者呈人字型构造。马连滩断裂位于隧硐北部边缘,走向北东,倾向北西,倾角60°—70°,为一个沿背
The tunnel project is located in the south near the tiger Yu Village. The geological structure in the area is shown in Figure 1. The structural line is mainly in the northeast direction, followed by north and northwest directions. The larger Hukuang fault (F_1) is located in the southeast of the project area, heading to the east, southeastern and eastward with a dip angle of 40 ° and fault breccia thickness of over a hundred meters. From the irregular shape of the rupture surface and the thick exposed breccias, it belongs to the tension structure surface. In addition, there are also Quejian fault (F_ (Ⅱ)) and Maliantan fault (F_ (Ⅲ)) in the project area. The former is located in the south of the tunnel, heading southwest. The fault breccia is several tens of meters thick. The breccia is composed of limestone and is cemented well. It belongs to Zhang-Zhang fault and is a branch of Hu-Yu fault. Both of them are herringbone structure . The Malingtan fault is located at the northern edge of the tunnel, heading north eastward with a northwest dip of 60 ° -70 °.