隧道断层破碎带三维综合超前预报应用研究

Research on the Application of 3D Comprehensive Advanced Prediction in Tunnel Fault Fracture Zone

隧道内断层破碎带是一种致灾性极高的不良地质体,施工过程中对其精准探测一直都是隧道超前地质预报的重难点。为有效预防因断层破碎带引发的隧道坍塌、突水、涌泥等事故,提出了基于TGP法+瞬变电磁法+地质雷达法的三维综合探测方法,并用于实际隧道工程中,取得了良好的探测效果。结果表明:1)TGP法、瞬变电磁法及地质雷达法优化组合形成的综合超前预报方法,不仅能有效提高探测的准确性,还能获取更全面的地质信息;2)采用三维探测及可视化技术能更直观、准确地展示断层破碎带的发育规模、性质以及与隧道的空间关系,为隧道建设提供更形象的预报成果。

The fault fracture zone inside the tunnel is a highly hazardous geological body,whose precise detection during construction has always been a key and difficult point in advanced geological prediction of tunnels.To effectively prevent accidents such as tunnel collapse,water inrush,and mud gushing caused by fault fracture zones,a three-dimensional comprehensive detection method based on TGP method,transient electromagnetic method,and geological radar method is proposed and applied on actual tunnel engineering,which achieves good detection results.The results show that:1)The comprehensive advanced prediction method formed by the optimized combination of TGP method,transient electromagnetic method,and geological radar method can not only effectively improve the accuracy of detection,but also obtain more comprehensive geological information;2)The use of three-dimensional detection and visualization technology can more intuitively and accurately display the development scale,properties,and spatial relationship with the tunnel of the fault fracture zone,providing more vivid prediction results for tunnel construction.