TBM Construction Process of Water Conveyance Tunnel Crossing Fault and Fractured Zone

ZHANG Yuting; ZHANG Chengcheng; LI Yue

doi:10.3969/j.issn.1004-7328.2025.02.021

Abstract：During the construction process of a water conveyance tunnel,the deformation of the surrounding rock affects the overall stability of the tunnel.Therefore,this article takes a certain water conveyance tunnel as the research object and uses the HSP217 advanced geological prediction instrument to predict the tunnel geology.Further,numerical software was used to establish a simulation of the full section construction process of the water conveyance tunnel,and the deformation laws of the tunnel arch crown,arch waist,and arch bottom during the construction process were obtained.By arranging different monitoring sections,the influence of the presence of fractured zones on the deformation stability of water conveyance tunnels was further studied.Research has shown that the seismic wave reflection interface within the mileage T50+250-50+450 section is obvious,with significant differences in surrounding background values.The number of structural plane groups is large and disorderly,which can be determined as fault fracture zones and influence zones.During the process of approaching the fractured zone,the deformation of the tunnel is relatively small.However,when the palm passes through the fractured zone,the deformation of the tunnel increases rapidly;The impact area of tunnel construction is divided into almost no impact zone(>3D),weak impact zone(1D～3D),and strong impact zone(<1D);When the tunnel passes through a fractured zone,the spatial effect of tunnel surrounding rock deformation will be significantly amplified,and necessary reinforcement measures can be taken if necessary.The research methods and content of this article can provide guidance and experience for similar projects.