赵庄煤业深埋软顶巷道合理支护参数研究OA

The buried depth of return air roadway in 1313 working face of Zhaozhuang Coal Industry is large,and the roof of roadway is soft rock,so it is necessary to study its reasonable support parameters.Through the observation of surrounding rock drilling,it is concluded that the shallow surrounding rock of 1313 return airway is relatively broken,and the range of loose circle of surrounding rock is 2 m.FLAC3D numerical simulation is used to determine the reasonable length of the bolt is 2.4 m,the diameter of the bolt is 24 mm,and the row spacing between the bolts is 0.9 m.The field application results show that after adopting the optimized support parameters,the maximum displacement of the roof and floor of the roadway is 95 mm,and the maximum displacement of the two sides is 63 mm.The overall deformation is small,which meets the needs of safe and efficient production in the mine.