湘桂铁路山乾隧道岩溶涌水涌泥原因分析及治理措施

山乾隧道是湘桂铁路永州至柳州段典型的岩溶浅埋隧道。根据初期地质调绘资料,并结合施工过程中揭示的岩溶发育程度及涌水情况,中铁二院开展了补充水文地质调查,分析了隧区地下水补给、径流、排泄条件和隧道涌水涌泥原因,并提出了设置短泄水洞+地表截排水方案和设置长泄水洞+集水通道方案。综合考虑投资、技术及运营安全,最终采用了设置长泄水洞+集水通道方案。在后期施工和运营中,隧道未再发生集中涌水涌泥,表明治理方案合理有效。

Cause Analysis of Water and Mud Gushing and Treatment Measures in Shanqian Karst Tunnel of Hunan-Guangxi Railway

Shanqian Tunnel is a typical shallow karst tunnel in Yongzhou-Liuzhou section of Hunan-Guangxi railway.According to the initial geological mapping data,combined with the karst development degree and water gushing situation revealed in the construction process,China Railway Eryuan Engineering Group Co.Ltd has carried out supplementary hydrogeology survey.The groundwater recharge,runoff,drainage conditions and the causes of water and mud gushing in tunnel were analyzed,and the schemes of setting short drainage tunnel+surface interception and drainage and setting long drainage tunnel+catchment channel were put forward.Considering the investment,technology and operation safety,the scheme of setting long drainage tunnel+catchment channel was adopted finally.In the later stage of construction and operation,there is no centralized water and mud gushing in tunnel,which indicates that the treatment scheme is reasonable and effective.