Study on the mine pressure law of overlying strata after hard roof cutting in the working face

DI Junchen; HAO Hongbo; DU Haohui; DONG Xiaojuan; SHEN Haoran; WANG Chenlin; SUN Lihui

doi:10.19458/j.cnki.cn11-2456/td.2025.06.010

Abstract：During the coal mining process in the working face with hard roof,large-scale roof caving is prone to occur in the goaf.When the roof collapses over a wide area,the mine pressure is manifested intensely,which seriously affects the safe production of the working face.To study the mine pressure law of the overlying strata after the hard roof is cut in the working face,the gently inclined coal seam with hard roof in the 9303 working face of Xipang Well was taken as the research object.The mechani-cal test,numerical simulation and theoretical analysis methods were adopted to analyze the variation law of the stress and subsidence of the overlying strata after the roof cutting.The results show that after the pressure relief of the working face,the pressure relief zone can be divided into the goaf pres-sure relief zone,the roof cutting pressure relief zone and the protective coal pillar pressure relief zone,and the stress in these zones is less than the original rock stress value.The lateral support pressure on the left side of the goaf overlying strata is greater than that on the right side,and it is about twice the original rock stress.The subsidence of the overlying strata in the pressure relief zone of the track road-way is the largest,followed by that in the goaf overlying strata,and the subsidence of the overlying strata in the pressure relief zone of the belt roadway is the smallest.The maximum value of the over-lying strata subsidence occurs in the middle position of the pressure relief zone of the track roadway.The research results provide an important theoretical basis for the safe mining of the mine.