铁路隧道排水对环境的影响分析

西铁车2号隧道位于山东省境内,全长7 851 m,洞身围岩主要为寒武系中统灰岩,无大规模岩溶现象,施工过程中,局部段落存在渗水现象,为了分析隧道排水对周围环境的影响,首先通过大口径井抽水理论计算分析隧道区域内的抽水影响半径,其次根据区域内的水文地质条件分析其补给、径流、排泄的关系,最后根据历年区域内的月降雨量综合分析隧道施工排水对区域水文地质环境的影响。根据影响半径预测隧道排水可能影响宽度为136~208 m,根据径流状态分析,隧道排水对泉峪村水井基本无影响,对西埠村水井有一定的影响,根据降雨量分析,2013年降雨量比2012年少了42.8%。综合上述分析,隧道开挖排水对泉峪村水井基本无影响,对西埠村水井有一定的影响,地下水水位下降的主要原因是该地区降雨量的大量减少。

Analysis of the Influence of Railway Tunnel Drainage on Environment

Xitieche No.2 tunnel is located in Shandong Province with a total length of 7 851 meters. The surrounding rock of the tunnel mainly belongs to the Cambrian System limestone without large-scale dissolution. During the construction of Xitieche No.2 tunnel,water seepage appeared in some sections of the tunnel. In order to analyze the impact of the drainage on the surroundings,this article theoretically calculates the range of dewatering influence within the tunnel region by using the pumping theory of big caliber well,and then analyzes the recharge,water-flow and drainage conditions based on the hydrogeological conditions within the region. And finally this article conducts a comprehensive analysis of the influence of drainage during construction on the hydro-geological environment nearby based on monthly regional rainfall over the years. According to the radius of influence,it is predicted that the width of136 ~ 208 m would be affected by tunnel drainage. The analysis of water flow shows that tunnel drainage brings little effect on the wells in Quanyu village,but some on Xibu village. The analysis of rainfall indicates that the rainfall in 2013 is 42. 8% less than that in 2012. The above analysis concludes that the tunnel excavation and drainage brings little effect on the wells in Quanyu village but some on Xibu village.The main cause for groundwater decline is attributed by much less rainfall in the two villages.