背斜蓄水构造隧道区水文地质特征及涌水预测——以下坝隧道为例

Hydro-geological characteristics and water gushing prediction in dorsal impoundment tectonic tunnel area——Taking Xiaba Tunnel as an example

纳晴高速下坝隧道位于堕却背斜蓄水构造,隧道穿越了龙潭地下河系统、汪家箐地下河系统和倮那地下河系统,隧道区岩溶发育强烈,地下河发育受构造控制,多为树枝状。本文将下坝隧道分为4个涌水量计算段,分别采用了泉流量汇总法、大气降水入渗法、地下水径流模数法、洼地入渗法等方法计算了动储量和静储量,最终计算出下坝隧道正常涌水量为20.01万m^(3)/d,最大涌水量为36.73万m^(3)/d,评价认为YK77+201~YK77+560进口段涌水量较小,不易发生突水、涌水,YK77+560~YK81+748中段和YK81+748-YK82+395出口段涌水量较大,极易发生突水、涌水。

The Xiaba Tunnel of the Nanqing expressway is located in the water storage structure of the falling anticline,the tunnel passes through the Longtan underground river system,Wangjiaqing underground river system and Luona underground river system,strong karst development in the tunnel area,and the development of underground river is controlled by structure,most of which are dendritic.In this paper,the Xiaba tunnel is divided into four calculation sections of water inflow,and the dynamic and static reserves are calculated by spring discharge summation method,precipitation infiltration method,groundwater runoff modulus method and depression infiltration method,respectively,the result shows that the normal water gushing amount is 200100 m^(3)/d and the maximum water gushing amount is 367300 m^(3)/d.the evaluation shows that the water gushing amount of YK77+201~YK77+560 inlet section is small,and it is not easy to occur water gushing and gushing,the middle section of YK77+560~YK81+748 and the exit section of YK81+748~YK82+395 have a large amount of water gushing,which is easy to occur water inrush and gushing.