武广客专某隧道涌水突泥成因及整治措施研究

Cause Analysis and Treatment Measures Study of Water and Mud Burst at the Tunnel on Wuhan—Guangzhou Passengers Dedicated Line

武广客运专线某隧道出口工区开挖至DK2081+097时,遇一张性断层,发生较大规模的涌水突泥灾害。分析认为该隧道穿越的张性断裂中充填较多的断层角砾、砂、黏性土等,为地下水良好的贮藏及运移通道,隧道开挖后即形成集水廊道,破坏了原有的地下水平衡系统,从而引起大量地下水携带沉积于张性断裂中的粉细砂、黏性土、粉土夹碎块石等涌入隧道。针对涌水突泥的成因,采用了对充填于断层裂隙中的砂、土进行封堵,对地下水采用堵排结合的综合整治措施。

Wuhan-Guangzhou PDL, when tunneled to DK2081+097, met an extension fault and was attacked by a large scale of water and mud burst. It was thought by analysis that, in this extension fault the tunnel passed through, there filled many fault breccia, sand and cohesive soil so that it was the good storage and migration pathway for underground water. After excavation, water collection gallery came into being and the original underground water balance system was disturbed, which resulted in a large amount of ground water inflow entrained with fine silty sand, cohesive soil, and silt with crushed stone deposited in the fault. In relation to the causes of the water and mud burst, the following comprehensive treatment measures were used that the sand and soil filled in the fault fracture was blocked and the combined plugging and drainage of underground water was carried out.