西安科技大学学报2025，Vol.45Issue(2)：252-262,11.DOI:10.13800/j.cnki.xakjdxxb.2025.0204
浅埋煤层复合采空区自燃"三带"动态演化规律和火灾防控
Dynamic evolution law and prevention of spontaneous combustion"three zones"in shallow buried coal seam composite goaf
摘要
Abstract
To study the dynamic evolution of spontaneous combustion"three zones"and oxygen con-centration distribution characteristics under different pushing distances in shallow coal seam composite goaf,the on-site measurement of oxygen concentration in goaf and analysis of air leakage mechanism were conducted.Fluent simulation software was used to obtain the dynamic evolution laws of the depth,width,and oxygen concentration of the oxidation zone in the lower goaf and the overlying goaf with in-creasing pushing distance,and comprehensive control measures were proposed.The results show that:In the secondary mining stage,with the increase of the advance distance,the oxidation zones on both sides of the overlying goaf and the lower goaf gradually extend backward,and finally form a"high on both sides,low in the middle"oxygen concentration distribution pattern within 100 m to 500 m of the goaf.At the same position,the width of the oxidation zone in the overlying goaf is less than that in the lower goaf,and its risk of spontaneous combustion is less than that in the lower goaf.Comparing the in-erting effect of multi-point combined infusion of liquid CO2 under different flow rates,it is found that when the flow rate of liquid CO2 injection is 1 000 m3/h,it can not only ensure the inerting effect,but also be economical.The research results indicate that the evolution law of"three zones"of spontaneous combustion in the composite goaf during the mining process of shallow buried coal seam,and provide reference for preventing and controlling the spontaneous combustion caused by air leakage in the com-posite goaf in shallow buried depth.关键词
浅埋煤层/复合采空区/"三带"分布/二次采动/动态演化Key words
shallow seam/compound goaf/"three zones"distribution/secondary mining/dynamic evo-lution分类
矿山工程引用本文复制引用
王建国,雒世龙,张超鹏..浅埋煤层复合采空区自燃"三带"动态演化规律和火灾防控[J].西安科技大学学报,2025,45(2):252-262,11.基金项目
国家自然科学基金项目(51634007) （51634007）
