Optimization of Azimuth Angle of Mining Approach of Sublevel Caving Method without Sill Pillar in Deep Mines
Reasonable layout of stope approach can effectively control the ground pressure effect and reduce the deformation and failure of the approach,and improve the safety production level and economic benefit of the mine.Based on the detailed investigation of the-400 m stage approach failure in Zhangfushan mining area of Jinshandian Iron Mine,the representative ore section of the-500 m stage to be mined was selected.Considering the influence of tectonic stress and steeply inclined dominant structural surface,the numerical simulation method was used to study the stability law of the approach when the azimuth angle changed.The results show that the smaller the angle between the approach azimuth angle and the maximum principal stress is,the smaller the volume of the rock shear failure zone is,and the rock shear failure mainly occurs at the top of the approach.The smaller the angle between the approach azimuth angle and the steeply inclined dominant structural surface is,the larger the volume of joint shear failure is.The joint shear failure mainly occurs in the diagonal upper or lateral side of the approach,and the failure zone is generally perpendicular to the joint surface.The steeply inclined dominant structural surface exacerbates approach deformation,causing a large displacement of the arch and sidewall of the approach,and the displacement of the sidewall is larger than that of the arch,resulting in a large deflection deformation of the approach section.The research results can provide optimization ideas for the approach layout of the same type of mines.
Deep minesSublevel caving method without sill pillarApproach azimuth angleUbiquitous-joint modelFLAC3D
万方数据
维普
