岩溶隧道突水灾害防治研究及优化分析

Research and Optimization Analysis of Prevention and Treatment of Water Bursting in Karst Tunnel

马口排隧道岩溶不良地质十分发育、复杂多变,并穿过破碎带或断裂构造破碎带,隧道施工开挖极易产生大规模坍塌,突水可能性较大。为控制突水风险,依托龙怀高速公路马口排岩溶隧道为工程背景,通过系统的实际现场地质勘察和理论分析,针对马口排岩溶隧道的岩溶发育规律进行探讨,充分考虑地层岩性、地下水位、预测突水量和人为因素等的影响,对马口排隧道岩溶段施工过程中的发生突水灾害的风险进行了分段评价。在此基础上,对不同突水风险段制订最佳超前地质预报方案,并根据预报情况优化突水灾害防治措施。经龙怀高速公路马口排岩溶隧道的应用证明,该研究可有效降低突水灾害现象发生所带来的损失,对于其他类似岩溶隧道的突水灾害防治具有一定借鉴意义。

The karst bad geology is very developed and complex and varied,and through the broken belt or fault structure fracture zone,tunnel construction excavation is easy to produce large-scale collapse,the possibility of water inrush. In order to control the risk of water inrush,relying on Longhuai expressway Makoupai tunnel as the engineering background,through the actual site geological survey and theoretical analysis of the system,the karst development law of Makoupai tunnel is discussed,groundwater level,predicted waterflooding and human factors,the risk of water bursting during the construction of karst section of Makoupai tunnel was evaluated. On the basis of this,the best advanced geological forecasting scheme for different water bursting risk areas is established,and the measures of water disaster prevention and control are optimized according to the forecast situation. The application of Makoupai tunnel in Longhuai expressway shows that the study can effectively reduce the loss caused by the phenomenon of water inrush and it is of great significance for the prevention and control of waterlogging in other karst tunnels.