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西南某山区高速公路越岭岩溶隧道所处区域地质环境条件复杂,全段不仅存在通过岩溶进行地下水近、远程补给而发生涌水突泥的风险,而且勘察发现进口段存在岩溶管道与临近龙湖存在水力联系,存在湖水倒灌的风险。因此,本文以隧道近场区地质建造和构造改造格架为分析物质基础,以地质作用过程机制为分析方法,通过调查、物探及钻探等手段基本查明隧址区环境地质条件,在此基础上建立水文地质原型,对地下水、地表水的补径排关系和渗流场特征,及岩溶空间展布特征展开分析研究,定性到半定量地进行了隧道涌水危险性预测评估,并以评价成果为依据对原隧道平纵布置进行了调整,以进一步降低建设和运营期间的涌水突泥危险性。
The geo-environmental conditions in the area where the cross-mountain karst tunnel in a certain mountainous area of southwest is complex are complex. The whole section not only has the risk of gushing out muddy water through karst near and far recharge of groundwater, but also finds the existence of hydraulic Contact, there is the risk of water intrusion. Therefore, based on the geologic construction and tectonic framework of the near-field tunnel in the tunnel, the geological mechanism of the geological process is taken as the analytical method and the environmental geological conditions of the tunnel area are basically ascertained through investigation, geophysical exploration and drilling. Based on this, On the establishment of hydrogeological prototype, the relationship between groundwater and surface runoff, the characteristics of seepage field and the distribution characteristics of karst space were analyzed and the qualitative and quantitative semi-quantitative prediction was made on the risk of tunnel water gushing. Based on the original layout of the vertical and horizontal tunnel has been adjusted to further reduce the risk of gushing mud during construction and operation.