To solve the problem of severe deformation and damage to the underlying coal seam recoveryroadway in close-distance coal mining groups,which affects the safe and efficient mining of the working face,this study focuses on a mine in the southwest of Shandong Province,China.Through theoretical analysis,numerical simulation,and combining the results of in-situ stress testing and mechanical experiments,the mutualinfluence between coal seams during close-distance coal mining and the manifestation of strata pressure ineach coal seam are investigated.The results show that after coal mining,the stress beneath the working face44decreases as it moves away from the roadway side,but the stress no longer decreases after reaching a certaindistance.By comparing and analyzing three different layouts of underlying recovery roadways,namely overlapping,dislocation,and insetting,it was found that the insetting layout resulted in the least deformation of the surrounding rock of the underlying recovery roadway.Based on the deformation of the surrounding rock in the underlying coal seam recovery roadway with the insetting layout,corresponding support schemes for the surrounding rock are proposed.The optimization of surrounding rock stress and deformation control showed significanteffects,enabling effective control of the roof of the recovery roadway during the underlying coal seam miningprocess.The research findings have important reference value for the layout and support optimization of close-distance coal seam mining roadways in mining areas with similar geological conditions.
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