煤矿安全2025，Vol.56Issue(5)：131-142,12.DOI:10.13347/j.cnki.mkaq.20241560
浅埋深交错煤层群覆岩运动规律及复合采空区自燃"三带"研究
Research on overburden movement laws and spontaneous combustion"three zones"of composite goaf in shallow buried depth and stereo-intersected coal seam group
摘要
Abstract
To thoroughly investigate the effects of coal seam group mining on overburden movement and coal spontaneous combus-tion risks,this study focuses on the composite goaf of the 12204 and 22206 working faces in Daliuta Huojitu Mine;this study sys-tematically studies the overburden movement and surface subsidence characteristics induced by coal seam group mining and further finds out the risk of coal spontaneous combustion risks in the composite goaf by integrating numerical simulations.Theoretical cal-culation combining with UAV-based measurements are used to comprehensively assess surface subsidence in the composite goaf.The study employed 3DEC numerical simulation software to simulate the impacts of composite coal seam mining on overburden movement.Simulation results were validated using surface subsidence data,and the Fluent software was utilized to refine the delin-eation of the spontaneous combustion"three zones"in the composite goaf by incorporating an oxygen consumption function.This facilitated an in-depth analysis of the spatial distribution characteristics of the oxidation zone and its implications for coal spontan-eous combustion risks.Theoretical calculations revealed that the maximum surface subsidence in the recompaction zones of the 12204 and 22206 working faces was 3.54 m and 1.06 m,respectively.UAV-based differential elevation measurements indicated that the surface subsidence in the overlapping goaf region reached up to 5 m.Simulated data showed that the surface subsidence coeffi-cient in the overlapping region of the coal seam group mining was 0.24,whereas the coefficient above the coal pillars in the lower coal seam was only 0.12.The surface subsidence caused by coal seam group mining was double that of single-seam mining.Further-more,after the lower coal seam was mined,the overburden experienced secondary compressive deformation,with the caving angle reduced by approximately 9° compared to the initial deformation.The oxygen field simulation using Fluent demonstrated that the ox-idation zone width on the intake side of the lower coal seam was approximately 143 m,while that on the return side was about 50 m.The oxidation zone areas of the upper and lower coal seam floors were 26 676 m2 and 24 003 m2,respectively,indicating a higher risk of spontaneous combustion in the upper coal seam.High oxygen volume fraction zones were primarily concentrated on the in-take side and in fracture-developed areas.关键词
浅埋深交错煤层群/覆岩运动/地表沉陷/复合采空区/自燃"三带"Key words
shallow buried depth and stereo-intersected coal seam group/overburden movement/surface subsidence/composite goaf/spontaneous combustion"three zones"分类
矿山工程引用本文复制引用
陈殿赋,倪权,吴兵,李杨..浅埋深交错煤层群覆岩运动规律及复合采空区自燃"三带"研究[J].煤矿安全,2025,56(5):131-142,12.基金项目
国家自然科学基金面上资助项目(52374252) （52374252）
