Research on Combined Mining Design for No. 2 and 3 Coal Seams and Its Influence in Muchengjian Mine
WEI Ping
ZHANG Jianbing
WANG Chengwu
ZHANG Ze
Abstract：In this paper, analysis was carried out on the feasibility of combined mining of No. 2 and 3 coal seams in Muchengjian Mine and the combined mining scheme for these seams was designed by using the theoretical analysis and numerical simulation. The influence scope of No. 2 and 3 seam mining on the overburden rock was obtained by theoretical analysis,it showed that the combined mining of these two seams is feasible. Research was made with the numerical simulation method on the stress distribution law of floor ( roof) rock stratum and its influence scope and degree upon the upper ( lower) rock ( coal) formation in the separate mining of the upper ( lower) coal seam. Research was also made on the stress distribution law and stress concentration degree of the rock stratum during the simultaneous mining of these two seams. Research results showed that when the distance between two working faces was 60m, the stress concentration scope caused by the combined mining of two seams was linked together,and the stress concentration coefficient increased about 21% under combined mining condition. The mining scheme was designed according to the simulation results. The monitoring data of real-time monitoring system ( RTMSD) and prop pressure system showed that the combined mining guaranteed the mine output and achieved the purpose of safe and efficient production.
Keywords：combined miningmining schemestress concentrationnumerical simulation
Publication Date：2013-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 12-15 )