Research and Application of Rectangular Roadway Support Design Considering the Compaction Effect of Goaf
In order to solve the problems of large deformation amount of surrounding rock and difficulty in supporting during working period of the 73upper16 working face transportation roadway,theoretical calculation and numerical simulation are used to verify the rationality of the support design parameters(anchor rod length 3.3 m,anchor cable length 6.2 m)for the 73upper16 working face transportation roadway.The results show that based on the theory of loose zone in roadway,the height of the loose zone on the roof of the roadway is calculated to be 2.9 m,the range of loose zones on both sides is 2.1 m,and the length of anchor rods and anchor cables effectively passes through the range of loose zones;A numerical calculation model considering the compaction effect of goaf is established.Through numerical simulation,it is found that the failure of the roof of the roadway surrounding rock is a gradually developing process.The fine sandstone layer that has not undergone complete failure cannot block the failure of sandy mudstone,and after adopting this support parameter,the plastic zone failure area of the roadway roof surrounding rock is reduced,and the deformation amount is effectively controlled.After on-site practice,the maximum displacement amount of the roof,floor,left and right sides of the roadway reaches 69 mm,58 mm,74 mm,and 78 mm respectively,and there is no significant deformation of the roadway occur during service period.
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