超前地质预报技术在岩溶隧道中的对比应用

COMPARATIVE APPLICATION OF ADVANCED GEOLOGICAL PREDICTION TECHNOLOGY IN KARST TUNNEL

特长可溶岩隧道中岩溶和水文地质条件复杂多变,规律性较差,盲目施工易造成突泥、突水及坍塌等事故,有效的超前地质预报为隧道安全掘进提供重要保障,目前尚无一种能独立解决各类地质问题的预报手段。本研究以中老铁路曼勒一号隧道为背景,以地质调查为基础,采用TSP、地质雷达、瞬变电磁及超前水平钻探等方法,对DK446+465~DK448+580段岩溶和地下水发育情况进行了预报,基本探明了预报段地质情况。同时,对各类预报方法进行了分析对比研究,希望为其他岩溶隧道的超前地质预报工作提供一定的借鉴参考。

The karst and hydrogeological conditions of extra-long karst tunnel are complicated and changeable,and the regularity is poor,blind construction is easy to cause produces accidents,such as mud outburst,water inrush,collapse,and so on.The effective advanced geological prediction is an important guarantee for safe tunneling of tunnels.At present,there is no prediction method that can solve various geological problems.Based on the background of Manle No.1 tunnel of China Laos railway and geological survey,the karst and groundwater development of DK446+465~DK448+580 section is predicted by using TSP,geological radar,transient electromagnetic and advanced horizontal drilling methods,and the geological conditions of the predicted section are basically proved.At the same time,all kinds of prediction methods are analyzed,compared and summarized,hoping to provide some reference for the advanced geological prediction of other karst tunnels.