浅埋近距离煤层上部采空区自燃危险区数值模拟研究
Numerical simulation study on spontaneous combustion hazard zone in upper goaf of shallow-buried short distance coal seams
王文才 1赵婧雯1
作者信息
- 1. 内蒙古科技大学矿业与煤炭学院,内蒙古包头 014010
- 折叠
摘要
浅埋近距离煤层群开采下部煤层时,地表裂隙经过二次发育连通上部老采空区,造成采空区内漏风增加,自燃危险性相应增大.以苏家沟煤矿5-1上煤层至地表空间为研究对象,借助Fluent数值模拟软件,研究地表漏风对复合采空区,特别是上部4-2中煤层采空区的自燃危险区域的影响.研究结果表明:采空区内氧气浓度随着与工作面距离得增加而逐渐降低,连通上部采空区与地表的裂隙对采空区内的氧化带分布产生影响,依据自燃危险区的划分标准,结合风流场及氧化带的分布云图确定自燃危险区域的位置和范围.
Abstract
When mining the lower coal seam in shallow and close distance coal seams,the surface fractures connect the old upper goaf through secondary development,resulting in an increase in air leakage in the goaf and a corresponding increase in the risk of spontane-ous combustion.Taking the space from 5-1 coal seam to the surface in Sujiagou Coal Mine as the research object,with the help of Flu-ent(a numerical simulation software),the impact of surface air leakage on spontaneous combustion dangerous zones of composite goaf,especially the upper 4-2 coal seam goaf,was studied.The research results show that the oxygen concentration in the goaf gradually de-creases as working face advances.The fractures connecting the upper goaf and surface have an impact on the distribution of oxidation zones in the goaf.According to the classification criteria for spontaneous combustion danger zones,combined with the distribution cloud map of the wind flow field and oxidation zone,the location and scope of spontaneous combustion danger zones are further determined.
关键词
浅埋近距离煤层/上部采空区/漏风/数值模拟/自燃危险区域Key words
shallow-buried and close distance coal seams/upper goaf/air leakage/numerical simulation/dangerous zones of sponta-neous combustion引用本文复制引用
基金项目
国家自然科学基金(52064043)
内蒙古自治区自然科学基金(2020MS05010)
出版年
2024
NETL
NSTL
万方数据