综合超前地质预报在岩溶隧道施工中的应用

Application of Integrated Advance Geologic Prediction to Karst Tunnels

在岩溶地区,富水、岩溶及断层破碎带等不良地质常是制约隧道正常施工的主要因素。超前地质预报是探查地下工程开挖掌子面前方不良地质情况、降低施工风险的一项重要技术措施,已成为岩溶地区隧道施工过程中不可或缺的重要工序。文章提出了运用"地质调查法+TSP+TEM+超前钻探"综合地质预报方法对岩溶地区隧道不良地质情况进行探查,建立了在地质调查法的基础上,使用TSP长距离辅助探测技术,以小线圈瞬变电磁法为核心手段,最后再通过超前地质钻孔来验证的综合预报流程。以某岩溶地区隧道为工程背景,采用了"地质调查法+TSP+TEM+超前钻探"综合超前预报方法,达到了提高预报准确性的效果。

In the karst area, the main factors that restrict the normal construction of tunnel are rich water, karst and fault fracture zone. Advance geological prediction is an important technical measure to eliminate the excavation of the tunnel in front of poor geolog-ical conditions, which has become an indispensable step in underground construction. This paper puts forward the comprehensive geo-logical prediction of karst area tunnels by using athe geological survey ＋ TSP ＋ TEM ＋ advanced drilling”. a comprehensive process was established based on geological investigation method. For the process, the TSP is used as long distance aided detection technology and small coil transient electromagnetic method is the core method of forecasting. Finally, the advanced geological drilling is utilized to verify the comprehensive forecasting process. For a tunnel project in karst area, The aforecast method of comprehensive geological sur-vey method ＋ TSP ＋ TEM ＋ advanced drilling” approach have the effect of improving the accuracy of forecasting.