Coal spontaneous combustion law and grading early warning under the condition of self-forming roadway without coal pillar
Liu Yu
Zhang Lei
Ma Lei
Abstract：Addressing the issues of poorly sealed goaf areas,severe air leakage,and coal seam spontaneous combustion in the application of"110 method"in spontaneous combustion coal seams,the study focuses on the prevention and control of coal spontaneous combustion un-der the conditions of"110 method"roof cutting roadway in No.13403 fully-mechanized mining face of Zhuji west coal mine.By conduc-ting air leakage tests,numerical simulations of"three zones"of residual coal spontaneous combustion in the goaf area,and tests on charac-teristic gases indicative of coal spontaneous combustion,the study analyzes the law of coal spontaneous combustion in the self-forming roadway face without coal pillars and determines the critical values of graded early warning indicators for coal spontaneous combustion.The results indicate that air leakage in working face and the goaf is primarily due to inflow from the air intake corner and support No.1-No.10,with most of the leakage occurring from supports No.44-No.61 at the tail end of working face.A ventilation method was selected that facilitates fire prevention,involving air intake through the No.13403 haulage roadway and the return air connecting roadway,and air return through the track roadway.Additionally,the distribution of the"three zones"of coal spontaneous combustion in the goaf was determined.CO gas volume fraction was chosen as an indicator to measure the stage and degree of coal spontaneous combustion.Based on experimental test results of characteristic gases of spontaneous combustion in the 13-1 coal seam,the early warning levels,temperature ranges,and early warning thresholds for each stage of spontaneous combustion in the 13-1 coal seam were divided.The research findings can serve as a ref-erence for the prevention and control of coal spontaneous combustion in self-forming roadway without coal pillar working faces.
Keywords：self-forming roadway without coal pillar110 methodcoal spontaneous combustiongrade early warning
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：6( 132-137 )