深埋岩溶隧道突水模式及影响因素的量化分析

Analysis of Water Inrush Mode and Quantitative Analysis of Influence Factors of Deep Buried Karst Tunnel

随着地下空间的不断开发,隧道工程建设不可避免的需要穿越岩溶区域。在岩溶隧道建设过程中,突水灾害时常发生,其突水机理复杂,影响因素众多。本文结合岩溶隧道现场施工资料,统计分析了深埋岩溶隧道突水模式及主要影响因素。为定量评估各因素对隧道突水的敏感程度,引入了层次分析法,建立隧道突水影响因素的层次结构模型,构造判断矩阵,对各层影响因素进行权重计算,对判断矩阵进行了一致性检验。分析结果表明:在主要影响因素中,不良地质、地层岩性和地下水位对突水的影响最大,三个因素权重之和占总权重的61.65%。岩溶隧道施工过程中,要提前详细探明工程地质条件和水文地质条件,采取相应的工程措施,降低突水灾害发生的可能性。

With the continuous development of underground space,the construction of the tunnel will inevitably need to pass through the karst area. In the process of construction of karst tunnel,water inrush disaster often happens. The occurrence mechanism of water inrush is complex. There are lots of influencing factors for tunnel water inrush. In this paper,combined with the site construction data of deep buried karst tunnel,the water inrush mode and main influencing factors are analyzed. In order to quantitative assessment sensitive degree of the factors of water bursting in tunnels,the analytic hierarchy process( AHP) method,to establish the hierarchical structure model of the factors affecting tunnel water inrush,constructs the judgment matrix,to calculate the weights of factors in each layer. The consistency test of judgment matrix was carried out. In the main influence factors,the analysis results show that unfavorable geology,formation lithology and the groundwater level are the most influential factors. Theweights of these three influencing factors are 0. 6565. In the course of construction of karst tunnel,to explore the engineering geological conditions and hydrogeological conditions in advance,and take the corresponding engineering measures to reduce the possibility of water inrush disaster.