Study on passing through fault technology of reconstructed air return gateway in soft roof and soft floor and soft seam

LU Qianming; HAN Hongqiang; ZHANG Ruilin; WANG Zhen; DONG Guanjie

doi:10.13199/j.cnki.cst.2017.12.012

Abstract：In order to make No.21122 coal mining face of Lugou Coal Mine successfully pass through fault,on the premise of the air returngateway layout unchanged,a comparison and analysis was conducted on the technical plan to pass through the fault.A technical plan withthe gateway driving to reconstruct the gateway and the gateway retained was determined.The technical plan could ensure the pushing for-ward speed of the coal mining face and could reduce the safety danger of the roof.With the numerical simulation on the vertical stress dis-tribution law of the different width coal pillar between the reconstructed gateway and the previous air return gateway,in combination withthe space location relationship of the two gateways,finally,the width of the coal pillar was determined as 6 m and the linkage horizontal in-cluded angle of the gateway was 34°.A reinforcement support plan of the reconstruction gateway,gateway sidewall support and the previousair return gateway was provided and a site practice of the support plan was conducted.The results showed that during the period of the coalmining face passed through fault,the cross section area of the retained gateway was kept over 84％ of the previous cross section area.Thecross section area could meet the ventilation requirements and could verify the rationality of the design parameters.