长大隧道涌水中水岩相互作用机理研究

Research on Interaction Mechanism of Water and Rock in Water Inflow of Long and Large Tunnel

长大隧道涌水的发生与地下水和岩土体的特性有密切的联系。不同围岩土体的地质构造不同,在地下水的作用下表现出不同的破坏机理。结合发生涌水灾害的大华岭长大隧道实例,经过实地考察和地质资料收集,运用地球化学和断裂力学有关理论具体分析长大隧道涌水的规模、位置、诱发因素以及地质条件,根据涌水发生地段隧道的岩石组成、地质构造状况,对该地区水岩作用机理及其与隧道涌水之间的关系进行探讨。研究表明,该地区水岩作用条件成熟,是大华岭长大隧道涌水灾害诱发和形成重要影响因素。

Water inflow in long and large tunnel has intimate relationship with the feature of groundwater and rock mass. Different wall-rock owns different geological structure, which shows different mechanism of destruction under the action of underground water. Taking the water inflows accidents in Dahualing long and large tunnel as a case, and based on the fieldwork and geological data, the relative theory of geochemistry and fracture mechanics are used to analyze the scale, location, inducing factors and geological conditions of water inflows of long and large tunnel in detail. According to the rock composition and geological conditions of water inflowing Tunnel, the water-rock interaction mechanism and its relationship with water gushing in this region are studied. The results show that matured water-rock interaction condition is a significant factor for inducing water inflow disasters in Dahualing long and large tunnel.