煤矿安全2025，Vol.56Issue(5)：20-29,10.DOI:10.13347/j.cnki.mkaq.20250202
堵漏风材料孔隙率对切顶留巷采空区气体运移的影响研究
Study on the influence of porosity of blocking air-leakage material on gas migration in goaf of cutting roof and retaining roadway
摘要
Abstract
In order to study the influence of the porosity of blocking air-leakage material on the O2,CH4 gas migration and the coup-ling disaster of coal spontaneous combustion and gas in the goaf of working face Y-type ventilation cutting roof and retaining road-way,taking the goaf of 110 working method working face of Dalong Mine as the object,based on Fluent simulation software,a sim-ulation model for the influence of the porosity of blocking air-leakage material on the gas migration in the goaf was constructed.The simulation study was conducted on six kinds of porosity(0,0.1,0.2,0.3,0.5,1.0)corresponding to four commonly used blocking air-leakage materials and two extreme ideal conditions of complete blocking air-leakage and complete open without blocking air-leak-age in the goaf of the working face with cutting roof and retaining roadway.The research results show that the porosity of blocking air-leakage material for the cutting roof and retaining roadway has a great influence on the O2 volume fraction distribution in the goaf.With the increase of the porosity,the position and range of the scattered zone and the spontaneous combustion zone in the goaf move back and expand.The width of the spontaneous combustion zone on the side of the main air inlet roadway and the side of the cutting roof and retaining roadway increases from 12 meters and 22 meters when the porosity is 0 to 19 meters and 60 meters when the porosity is 1.0.The range on both sides of the spontaneous combustion zone increases by 58.3%and 172.7%respectively,the spontaneous combustion zone with narrow strip distribution and expanding range appeared on the roadway side of the working face.The high concentration gas accumulation area moves to the deep part of the goaf and the accumulation area decreases continuously.The accumulation starting position moves from 100 meters lagged working face to 150 meters lagged working face.With the in-crease of porosity,the area of coupled disaster of coal spontaneous combustion and gas is constantly expanding.Compared with the three methods of blocking air-leakage by spraying polyurethane foam,using modified cement mortars,cement mortars and filling with gangue,the area of coal spontaneous combustion and gas coupling disaster in goaf is significantly reduced,which is more con-ducive to the management of coal spontaneous combustion and gas coupling disasters in goaf.关键词
堵漏风材料/孔隙率/采空区漏风/聚氨酯泡沫/切顶留巷/气体运移Key words
blockin gair-leakage material/porosity/goaf air leakage/polyurethane foam/cutting roof and retaining roadway/gas migration分类
矿山工程引用本文复制引用
撒占友,姚渠恒,杨永亮,田立志,秦玉金,卢守青,刘杰..堵漏风材料孔隙率对切顶留巷采空区气体运移的影响研究[J].煤矿安全,2025,56(5):20-29,10.基金项目
国家自然科学基金资助项目(52474235,52404222) （52474235,52404222）
山东省自然科学基金资助项目(ZR2018PEE00) （ZR2018PEE00）
