Application research on roof cutting and pressure relief self-forming roadway in deep gently inclined coal seam
In view of the geological conditions of-780 m buried depth,deep gently inclined coal seam at an average of 15° and the dif-ficulty of asymmetric large deformation supporting of surrounding rock in Linsheng Coal Mine,the key parameters such as roof cutting height,roof cutting angle and constant resistance large deformation anchor cable supporting were obtained by theoretical calculation.Through numerical simulation and field blasting test,the design parameters of slit depth of 8.0 m,slit angle of 75°,hole sealing length of 3.0 m,hole spacing of 500 mm,and charging structure of3+3+2+1 were optimized for No.1221 transport roadway in Linsheng Coal Mine.The results of mine pressure monitoring data indicate that the deformation of roadway surrounding rock basically tended to be stable when the lag working face was about 170 m,the maximum roof subsidence was 165 mm,and the floor heave was 38 mm,which was close to the numerical simulation results of FLAC3D,which proved the correctness of the roof cutting and pressure relief theory.After gob-side entry retaining,the roadway deformation was small,the surrounding rock of the on-site roadway was intact,and there was no failure phenomenon.The successful application of the deep gently inclined coal seam in this test can provide certain reference for the further popularization and application of the automatic roadway formation technology by roof cutting and pressure relief.
deep gently inclined coal seamdifficulty in supportingroof cutting and pressure relief self-forming roadwayfield test
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