隧道断层地面地质调查技术及应用

在隧道施工中,经常遇到的不良地质构造即为断层,它是造成隧道塌方的主要原因之一,也是涌突水、煤与瓦斯突出,甚至岩爆等诸多隧道施工地质灾害产生的原因。由于在设计阶段地质勘查工作的精度有限,往往造成断层位置不准确甚至遗漏,因此在施工阶段,在设计勘察资料的基础上,采取地面地质调查手段对断层进行修正和完善显得非常重要。在总结前人施工经验的基础上,介绍了安康至陕川界高速公路MC2合同段特长隧道毛坝1号隧道在断层施工和地面地质调查中的实践经验,论述了地面地质调查技术在断层施工预防和治理方面的重要性。

Surface Geological Investigation Technology and Its Application in Tunnel Construction under Fault Condition

In tunnel construction,the most common hazardous geological condition shall be fault,which is the main reason for tunnel collapse,as well as the root source of all geological disasters during tunnel construction such as water gushing, coal and gas outburst even rockburst.The inaccuracy of geological investigation during design stage often results in inaccurate fault locating or even fault missing;therefore,during the construction phase,it is essential to improve or correct the fault＇ s geological data through site surface geological investigation based on geological survey report provided during design stage.This article is based on the summarized data from previous construction,and built upon experiences obtained from surface geological investigation and lessons from tunnel construction under fault geological condition in the super-long Maoba No.1 Tunnel of Ankang-Shanchuanjie Highway Contract Section MC2,to explain the importance of surface geological investigation technology in preventing and dealing with fault geological condition in construction.