贵州某公路隧道岩溶水文地质研究

Research on Karst Hydrogeology of a Highway Tunnel in Guizhou

针对贵州某高速公路隧道进口右洞施工掌子面YK21+125处发生涌水的实况,通过分析隧道所处的地质构造环境、岩溶管道、地下暗河,综合判定该隧道形成了两组岩溶水系统,该隧道位于北部梁家屯岩溶水系统内,南部大尧寨岩溶地下水系统对隧道没有影响;设计开展了地下水示踪试验,查明隧道突涌水来源、途径以及地下水流速和岩溶管道介质特征。通过分析隧道岩溶水文地质特征及机制,提出防治建议措施。

In relation to the reality of water gushing occurred at the construction face YK21+125 of the entrance right hole of a highway tunnel in Guizhou,by analyzing the geological structure environment,karst pipeline and underground dark river in which the tunnel is located,it was determined that the tunnel formed two groups of karst water system,which is located in Liangjiatun karst water system in the north and Dayaozhai karst groundwater system in the south has no influence on the tunnel;and designed to carry out groundwater tracer test,which identified the source and way of sudden surge water in the tunnel as well as the groundwater flow rate and karst pipeline media characteristics.Through the analysis of the tunnel karst water hydrogeological characteristics and mechanisms,recommended prevention and control measures were put forward.