Research and Application of Roof Cutting Pressure Relief Gob-side Entry Retaining Technology in Shallow Medium-thick Coal Seam
In order to alleviate the tension of mine connection,reduce the amount of mine roadway en-gineering,based on the 3下A07 working face of Luxi Coal Mine as the research background,combined with the production geological conditions,theoretical analysis and field measurement methods,the key parame-ters of roof cutting and pressure relief gob-side entry retaining technology in shallow medium thick coal seam are studied.The height of pre-splitting roof cutting is 6.28～10 m,the angle of roof cutting is 15°,the blasting spacing is 600 mm,and the slit charging structure is 2+1+1.The deformation of surrounding rock is monitored by arranging measuring stations in the roadway,and the effect of gob-side entry retaining with roof cutting and pressure relief is evaluated.The results show that the deformation of the surrounding rock of the roadway is small,the maximum displacement of the roof is 193 mm,and the maximum displacement of the two sides is 235 mm.The roof rock in the goaf is full of gangue side after collapse,with good stability and no obvious floor heave phenomenon.The roadway is complete and meets the conditions of use.The re-search results can provide reference for the roof cutting and pressure relief gob-side entry retaining project under similar conditions.
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