DOI: 10.11799/ce202411002
Layout and pressure relief technology of island-like working face in deep contiguous coal seams
WANG Xudong
QIAO Wenjun
WANG Peng
DONG Junliang
ZHAO Hai
Abstract：In the later period of mining in deep contiguous coal seams group,an island-like working face is likely to form in the upper coal seam with ongoing seam goaf on one side and lower seam goaf on the other side,and the location design of the face directly affects the mining intensity.Combining with the geological and mining conditions of Xinjie No.1 Mine,in terms of on-site investigation and analysis,the'T plus dash'type structure of island-like face wall rock in upper contiguous coal seams is proposed and the potential mining risk factors are elaborated.Three layout schemes are proposed based on the positional relationship between island-like face and solid coal in lower coal seam,and eight island-like face layout models are established based on discrete element numerical software.It is concluded that the solid coal in the coal seam should be staggered downwards on the island-like face,and when the staggered distance is about 25 m,the peak stress increase coefficient of the solid coal seam side decreases to below 1.5,and the stress of the coal pillar seam apparently decreases,which turned out to be a rational face layout.Considering a possible thick and hard roof on island-like face,we put forward the method of rational layout plus roof pre-splitting and mining after pressure relief,which provides a reference for similar ongoing projects.
Keywords：deep miningcontiguous coal seamsisland-like working facediscrete element simulationpressure relief mining
Publication Date：2024-11-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 7-12 )