溶蚀断层破碎带涌水突泥施工及治理技术

Mitigation of Groundwater Intrusions in Broken Rock Mass in Tunnel Construction

超长连续溶蚀断层破碎带是影响隧道正常施工的不良地质构造之一,极易引起大面积塌方、突水涌泥以及大变形等工程事故。通过介绍龙潭隧道左洞突水涌泥的基本情况,总结了溶蚀断层破碎带突水涌泥过程中采取的施工及治理方法,详细论述了相关施工工艺。结合数值仿真,依据隧道突水后的地下水在隧道中的运动形态的模拟,有效优化隧道预警过程中的逃生路线。实践证明,此施工方法能有效减小突水、涌泥等灾害事故的影响,达到溶蚀断层破碎带区安全施工的目的。

Large continuous broken rock mass in the fault area is one of the adverse geological conditions in the tunnel construction.Geo-hazards such as large scale collapse,groundwater intrusion,are prone to occur under this condition.This paper presents a case history of the groundwater intrusion mitigation in the construction of left tunnel of Longtan Tunnel.The construction techniques that were used in this mitigation are summarized in the paper.Further,the groundwater movement is simulated with numerical analysis.The evacuation route is also optimized through the numerical analysis.