Research on identification and anti scouring technology of remaining coal pillars in multi-seam mining goaf
Wang Shuai
Guo Wenhao
Luo Junli
Wen Yingyuan
Guan Weiming
Zhang Xiaolei
Zhang Yu
Guo Jisen
Abstract：Addressing the issues of identifying remaining coal pillars and the stress transfer in mined-out areas of multiple coal seams,the coal pillars in the mined-out area of Lower1 coal seam in a mine in Xinjiang was taken as the engineering background.The FLAC3D numerical simulation method was utilized to analyze the plastic zone range and stress transfer of coal pillars with different widths in goaf of Lower1 coal seam,and identify the critical value of the width of remaining coal pillars.Based on the protective layer mining theory,the influence range of the remaining coal pillars was calculated,and a technical plan for monitoring and prevention of mining and excavation work faces under the influence area of the remaining coal pillars in goaf was formulated.The results indicate that the critical width of re-maining coal pillar in goaf of Lower1 coal seam is 22 m;the stress peak of the 24 m remaining coal pillar is the highest,reaching 48.8 MPa,which has the potential to induce rock burst;as the width of coal pillar increases,the stress peak gradually decreases.When the coal pillar width is 200 m,the stress distribution of coal pillar exhibits a plateau pattern;the influence range of remaining coal pillar in goaf of Lower1 coal seam in terms of strike and dip is 45 m and 20 m below and on both sides of coal pillar,respectively.The research results can provide references for the identification of remaining coal pillars in goaf of multiple coal seams,as well as for the prevention and control of rockburst in the affected areas of underlying coal seams passing through the remaining coal pillars.
Keywords：remaining coal pillarnumerical simulationtheoretical calculationrock burstprevention and control technology
Publication Date：2025-12-30
Online Publishing Date：2026-01-31(First online date of this platform, not the publication date of the document)
Pages：5( 213-217 )