Study on mine strata behavior law of high cutting and paste backfill coal mining face

CHENG Xianzhen; XU Xueqing; LUAN Hengjie; LIN Dongcai; ZHAO Yixian

doi:10.13199/j.cnki.cst.2017.12.011

Abstract：According to many mine strata pressure disasters frequently occurred during the mining period of high cutting coal mining face,with No.1331 coal mining face in Xuchang Mine as a case,based on the numerical simulation method,the controlled variation was applied to determine the rational backfill interval and the site set monitoring and measuring point,a monitoring and analysis study was conducted on the mine strata pressure law of the high cutting and paste backfill coal mining face.The results showed that the longer the backfill interval of the high cutting backfill coal mining face would be,the far distance of the support pressure peak at the front of the coal mining face to the coal wall would be and the higher the value would be,but the variation would not be over 3％.Under the different backfill interval,the max subsidence variation of the roof to be backfilled would be over 10％ and the max subsidence variation in the goaf would be over 5％.The discreteness of main roof weighting interval in the coal mining face would be high,the initial roof weighting interval would be 20.1 ～43.3 m,the periodical roof weighting interval would be 14～22 m,the roof weighting intensity would be small and the backfill material in goaf could effectively support the roof.With the coal mining face pushed forward,the strength of the backfill mass would be continuously increased,the stress of the backfill mass would be stabilized with a period of two months and thus the overburden strata movement above the coal mining face would be in stable.