Asymmetric Deformation Law and Control Technology of Steeply Inclined Soft Slope Roadway

CHENG Shiyi

doi:10.16545/j.cnki.cmet.2024.04.010

Abstract：In order to explore the deformation law and control technology of soft coal roadway,deep trapezoidal coal roadway was taken as the research object.Flac-3D software was used to simulate the deformation of roadway under different coal thickness,revealing the deformation characteristics of roadway under 1.0 m,2.5 m and 8.0 m coal thickness.By analyzing the coupling support model,a coupling support technology of"anchor+spray+injection+W-shaped steel strip"was proposed,and the feasibility of the coupling support technology was verified through numerical simulation and on-site tunnel experiments.The research results showed that the deformation of the tunnel was proportional to the thickness of the coal seam,the deformation of the soft slope roadway exhibited asymmetric deformation characteristics,and the maximum horizontal displacement of the simulated coupled support roadway decreased by 91.6％,the maximum displacement of the left bottom plate decreased by 95.8％,and the maximum horizontal displacement decreased by 88.7％.In on-site tests,the maximum deformation of the roadway was 40 mm,and the passive support anchoring force was between 80～85 kN.This indicated that coupled support improved the soft rock structure,and compensated for resistance strength,and achieved strength coupling,anchoring force coupling,and energy coupling,and effectively controlled the soft rock roadway,providing technical reference for deep soft rock roadway support.