Study on deformation characteristics and influencing factors of surrounding rock in water diversion tunnel traversing multiple fault fracture zones
XIE Fuxing
Abstract：In response to the technical challenges of the water diversion tunnel in the Central Shanxi Water Transfer Project traversing multiple fault fracture zones,this study systematically analyzes en-gineering difficulties such as complex geological conditions and poor surrounding rock stability en-countered during the excavation of deep-buried tunnels through fault zones.A three-dimensional nu-merical model of the tunnel-fault system was established using the FLAC3D numerical simulation platform.The research focuses on the full-cycle response characteristics of surrounding rock during tunnel excavation through fault fracture zones,including excavation disturbance,stress adjustment,and stabilization phases.It reveals the evolution patterns of plastic zones and stress redistribution fea-tures in surrounding rock during different construction stages.Through damage morphology analysis,this paper proposes for the first time a classification of tunnel surrounding rock failure modes into three types:high-position shear failure,full-section extrusion failure,and low-position tensile failure,and establishes corresponding differentiated control strategies.Additionally,a detailed analysis of key influencing factors for tunnels crossing fault fracture zones is conducted,identifying grouting rein-forcement and in-tunnel strengthening as critical control methods.The research outcomes provide the-oretical foundations for stability control in deep-buried tunnels traversing complex fault zones and offer significant reference value for disaster prevention in similar underground engineering projects.
Keywords：water diversion tunnelfault fracture zonefailure typesdeformation mechanismsinfluencing factors
Publication Date：2025-06-15
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 24-30 )