Research on optimization of coal pillar and roadway stability control in extra-thick coal seam working face section
LI Yu
MA Jingyi
Abstract：In order to solve the difficult problem of controlling the deformation and damage of the roadway sur-rounding rock caused by strong mining in the working face of Dongpo Coal Mine,taking the continuously de-formed roadway in the process of mining back of 923 working face of the mine's extra-thick coal seam as the engineering background,the physical and mechanical parameters of the surrounding rock of the 923 roadway are obtained through laboratory tests,and the deformation and damage characteristics of the surrounding rock of the roadway are elucidated.Theoretical calculation methods are used to determine the range of the plastic zone and the width of the coal pillar,and the FLAC3D numerical calculation model is used to analyze the distribu-tion and evolution characteristics of the stress field and plastic zone of the roadway peripheral rock under the conditions of different coal pillar widths.Based on the results,the optimized width of coal pillar is 18 m.Meanwhile,the support parameters of 923 roadway perimeter rock are optimized.The reasonableness of the op-timized width of coal pillar and support parameters is verified through on-site engineering practice and mining pressure observation.Therefore,the research results have important reference value for the stability control of the roadway under similar conditions.
Keywords：extra-thick coal seamroadway supportcoal pillar widthnumerical simulationcontrol technology
Publication Date：2024-08-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 13-21 )