Research and application of pressure relief treatment technology in extremely close up and down mining face
Aiming at the problem of serious advanced deformation of the lower working face in the process of simultaneous mining of extremely close coal seams in Shanxi Lingshi Huayuan Coal Industry Co.,Ltd.,technical research and practice were carried out.Through theoretical analysis,the pressure source of No.10 coal seam is due to the serious mine pressure caused by the roadway deformation caused by the dynamic pressure superimposed on the lateral static pressure of the upper coal seam mining.It is proposed to cut off the arc triangle plate at the end of the working face by the method of pre-splitting roof cutting in the upper coal seam,reduce the influence of No.9 coal seam mining on No.10 coal seam,reduce the roadway deformation of the lower coal seam,reduce the roadway deformation by more than 40%,and ensure the safety of the working face.The demand for production also provides technical reference for other mine working faces with similar conditions.
Close distance coal seamCombined miningSurrounding rock deformationRoof cutting pressure reliefDeformation control
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