综合超前地质预报在新铜锣山隧道中的运用

Application of a Comprehensive Geological Prediction System to Construction of the New Tongluoshan Tunnel

南渝高速公路铜锣山隧道穿越煤层、采空区、巨型断层带,地质条件极为复杂,施工中极易发生煤与瓦斯突出、突涌水等危险。由于常规预报方法技术都有其适用条件和优缺点,任何单一方法均难以对掌子面前方地质情况作出准确判断,因此在铜锣山隧道施工中采用了综合超前地质预报技术,结合真反射层析成像(TRT)、瞬变电磁(TEM)、地质雷达(GPR)等多种方法的探测结果,通过多参数相互映证获取了掌子面前方的围岩及地下水赋存情况。该技术为隧道施工安全提供了及时预警,取得了良好的预报成果,为隧道施工方案制定和设计变更提供了可靠的技术依据。

The Tongluoshan tunnel on the Nanchong-Chongqing motorway passes through a coal seam, goaf and gi- ant fault zones with complicated geological conditions. It will very likely encounter the geological hazards of coal and gas outbursts and water inflow during construction. Considering that conventional prediction methods have their applicable conditions and advantages and disadvantages, it is difficult to make an accurate judgment of geological conditions by any single method, and so a comprehensive geological prediction system that combines tunnel reflec- tion tomography （TRT）, transient electromagnetic method （TEM） and ground penetrating radar （GPR） was implement- ed during construction of the Tongluoshan tunnel. The conditions of surrounding rock and underground water ahead of the working face were obtained based on mutual multi-parameter corroboration. This method provides safe and timely early warnings for tunnel construction and reliable technical supports for the determination and alteration of the construction scheme.