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1 工程概况1.1 地质水文羊寨隧道位于云贵交界的黄泥河左岸,高出水面45～55m。地表起伏大,植被欠佳。区域内主要为碳酸岩组成的中低山,溶沟、溶槽发育。地下有暗河及溶洞。岩石主要有页岩、灰岩和白云岩。出口段主要为滑坡堆积层、坡残积层。在地质构造方面,有3条大断层与隧道相交。在DK540+450下方54m处,有羊寨暗河横过,线路左侧有4个大型溶蚀洼地,雨季时大量水渗入洞内,经测定渗入水量昼夜约1.6万m~3。隧道位于地震基本烈度小于6度区域内。1.2 结构型式隧道为单线电气化铁路隧道。进口里程
1 Project Overview 1.1 Geology and Hydrology The sheep tunnel is located at the left bank of the Huangni River at the junction of Yunnan and Guizhou, 45 ~ 55m above the water surface. Large surface undulation, poor vegetation. The area is mainly composed of carbonates in the low-mountain, ditch, groove development. Underground river and cave. The rocks are mainly shale, limestone and dolomite. The exit section is mainly landslide accumulation layer, slope residual layer. In the geological structure, there are three major faults intersect with the tunnel. At 54m below the DK540 + 450, there is a crossing across the Yangzhai River. There are four large-scale erosion depressions on the left side of the line. During the rainy season, a large amount of water seeped into the cave. The infiltration volume was estimated to be about 16,000 m 3 day and night. The tunnel is located within the area where the earthquake’s basic intensity is less than 6 degrees. 1.2 structural type tunnel for the single-line electrified railway tunnel. Import mileage