DOI: 10.11799/ce201708013
Study on ascending mining of close distance coal seams group
PANG Dong-dong
Abstract：In order to study the influence of No.8 seam mining on the upper No.11 seam,theoretical analysis and numerical calculation were used to study the change law of the displacement field and stress field of the upper No.11 seam floor during ascending mining.The results show that No.11 seam is located in the curve subsidence zone of No.8 seam mining,the coal body has certain damage,but it has a good continuity,and the stress of the upper coal seam is reduced because of the mining of 14128 working face and the stress decreasing zone has formed;at the same time,the permeability of No.11 coal increases,the gas pressure reduces,and pressure-relaxing effect is obvious,and it provides protection for the safe mining of No.11 seam which is of high gas.At last,the influence range of pressure relief is calculated.
Keywords：ascending miningnumerical calculationclose distance coal seams groupgas pressure
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 46-49 )