严重不良地质隧洞局部调线综合探测技术的应用  

Comprehensive Detection Technology of Local Alignment of Tunnel in Serious Unfavorable Geology

作　　者：徐刚 Xu Gang(Second Engineering Limited Company of China Railway 18th Bureau Group,Fengrun 064001,China)

机构地区：[1]中铁十八局集团第二工程有限公司,河北丰润064001

出　　处：《市政技术》2024年第9期135-145,共11页Journal of Municipal Technology

基　　金：中铁十八局集团有限公司科技研究开发计划项目(G20-53)。

摘　　要：综合探测技术能有效探明隧洞周边断层破碎带、软弱夹层、含水构造等不良地质体信息,可为隧洞局部改线提供重要依据。因此,在解决狮子山输水隧洞DLII38+372—DLII38+420段出现围岩渗透破坏、塌方、突泥涌水等难以处置的工程问题中,采用TRT6000、TGS、瞬变电磁法等探测技术对隧洞线路局部调整提供了支撑。隧洞掌子面前方超前综合地质探测结果表明,地震波法和电法探测结果与超前钻探结果吻合性较好,隧洞掌子面前方节理裂隙发育,岩体破碎,开挖时易出现股状流水或涌泥,说明隧洞局部调线是必要的;隧洞左、右边墙综合探测预报表明,隧洞左侧低阻异常区往内侧延伸大于10 m,变形、塌方、涌水突泥风险高,右侧30 m深度内钻孔基本无水,地下水活动弱,地质条件相对稍好,线路可往右侧调整。该探测结果可为输水隧洞线路调整提供详细的地质参考,同时也可为类似工程问题提供案例参考。Comprehensive detection technology can effectively detect information of unfavorable geological bodies such as fault fracture zones,weak inter-layers and water-bearing structures around tunnels,and provide important basis for local tunnel realignment.In order to solve the engineering problems of rock seepage damage,collapse mud and water inrush in the DLII38+372 to DLII38+420 sections of the Shizishan Tunnel,detection technologies of TRT6000,TGS and transient electromagnetic method are adopted to provide support for local adjustment of the tunnel route.The comprehensive geological exploration results in front of the tunnel face show that the seismic and electrical detection results are in good agreement with the advanced drilling results.The joint fissures in front of the tunnel face are developed and the rock mass is broken.And there is a tendency for flowing water or mud during excavation,indicating that local alignment adjustment of the tunnel is necessary;The comprehensive detection and prediction of the left and right side walls of the tunnel indicate that the low resistance abnormal area on the left side of the tunnel extends more than 10 meters to the inner side,with high risks of deformation,collapse and water and mud inrush.The drilling within a depth of 30 meters on the right side is basically waterless,with weak groundwater activity and relatively good geological conditions.The route can be adjusted to the right side.The detection results can provide detailed geological references for the adjustment of the diversion tunnel route,and also provide case references for similar engineering problems.

关 键 词：输水隧洞 不良地质 改线方案 综合超前地质预报 超前钻探 

分 类 号：U452.1[建筑科学—桥梁与隧道工程] P631[交通运输工程—道路与铁道工程]