关键词: 褶曲构造区, 底板破坏, FLAC2D, 侧压系数, 大直径钻孔

Abstract: Near Yuwu coal mine N2105 mining face to fold zone, ahead of the coal face in the fold zone into the wind drift floor heave, and the occurrence of the 2 serious floor rock burst. The heading is located in the fold zone as the engineering background, using the field investigation, theoretical analysis, numerical simulation, micro-seismic monitoring and underground test, to study the failure mechanism and control measures of floor deformation. Conclusion: fold tectonic region of lateral pressure coefficient value minimum 1.56, maximum 2.18, strong tectonic stress zone; with the increase of lateral pressure coefficient, there is a mutation point, when λ > 1.5 after the roadway floor in the plastic zone is expanding rapidly, a sharp deterioration in the stability of the surrounding rock bottom; large diameter drilling unloading. The pressure can effectively inhibit the dynamic and static load combination strength, good control effect on the floor deformation. The research results provide a reference for exploring the failure mechanism and prevention technology of the tunnel floor in the fold structure area.