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隧道工程在施工前全面彻底、准确查明隧道围岩和其不良地质现象(断层、破碎带、溶洞、暗河等)所处状态是十分困难的。在隧道工程修建过程中超前地质预报作为隧道工程施工过程中规避施工风险的一项重要保证手段,已被广泛运用。本文结合永宁高速公路樟林隧道工程施工,介绍地震反射波法和超前水平钻孔两种地质超前预报方法应用于不良地质条件下的隧道开挖,取得良好的效果,供同行参考。
It is very difficult for the tunneling project to be comprehensively and thoroughly before construction and to accurately identify the surrounding rock of the tunnel and its adverse geological phenomena (faults, broken belts, caves, underground rivers, etc.). In the process of tunnel construction, advanced geological forecasting has been widely used as an important guarantee to avoid the construction risk in the process of tunnel construction. Combined with the construction of Zhanglin tunnel of Yongning Expressway, this paper introduces two kinds of geological advanced prediction methods, seismic reflection wave method and advanced horizontal drilling, which are applied to tunnel excavation under unfavorable geological conditions and obtain good results for reference of peers.