Simulation analysis on roadway layout and roof control in underlying working face in close distance coal seam
ZHUANG Tong
TIAN Jun
ZHAO Qifeng
JIANG Shiyuan
YANG Xuehong
SHEN Chunyang
Abstract：To solve the problem of severe deformation and damage to the underlying coal seam recovery roadway 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,nu-merical simulation,and combining the results of in-situ stress testing and mechanical experiments,the mutual influence between coal seams during close-distance coal mining and the manifestation of strata pressure in each coal seam are investigated.The results show that after coal mining,the stress beneath the working face decreases as it moves away from the roadway side,but the stress no longer decreases after reaching a certain distance.By comparing and analyzing three different layouts of underlying recovery roadways,namely overlap-ping,dislocation,and insetting,it was found that the insetting layout resulted in the least deformation of the sur-rounding rock of the underlying recovery roadway.Based on the deformation of the surrounding rock in the un-derlying coal seam recovery roadway with the insetting layout,corresponding support schemes for the surround-ing rock are proposed.The optimization of surrounding rock stress and deformation control showed significant effects,enabling effective control of the roof of the recovery roadway during the underlying coal seam mining process.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.
Keywords：close distance coal seamunderlying working faceroof controlnumerical simulation
Publication Date：2023-12-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：11( 44-54 )