Comprehensive Detection Technology of Local Alignment of Tunnel in Serious Unfavorable Geology
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 tun-nel 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 ex-cavation,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.
water diversion tunneladverse geologyline change plancomprehensive advanced geological predic-tionadvanced drilling
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