Affecting Factors of Stress and Deformation of Surrounding Rock in Water Conveyance Tunnel Excavation
GE Mingyuan
Abstract：The stability of surrounding rock in fault fracture zones is poor,and the excavation of water conveyance tunnels through such zones can lead to disasters such as collapses,water inrush,and mud bursts.To address this issue,a water conveyance tunnel project passing through a fault fracture zone was studied.A three-dimensional model was established using finite element software to simulate the entire tunnel excavation process,obtaining deformation curves for the tunnel crown,invert,and left haunch during excavation.Using the control variable method,the effects of fault fracture zone width,fault angle,and tunnel burial depth on tunnel deformation were systematically analyzed.The results showed that during the advancement of the working face,the deformations of the tunnel crown,invert,and left haunch exhibited a"first increase then decrease"trend.The influence of the fault fracture zone on tunnel deformation could be divided into three sections:weakly affected zone,sub-affected zone,and main affected zone.Greater fault fracture zone width and tunnel burial depth led to increased deformation at various tunnel locations,but the position of peak deformation remained unchanged.The safety of the water conveyance tunnel was lowest when crossing a fault fracture zone with a dip angle of 45°.
Keywords：water conveyance tunnelfault fracture zonefinite element softwaresurrounding rock deformationinfluencing factor
Publication Date：2025-09-20
Online Publishing Date：2025-10-10(First online date of this platform, not the publication date of the document)
Pages：4( 75-78 )