煤矿安全2024，Vol.55Issue(7)：68-77,10.DOI:10.13347/j.cnki.mkaq.20231244
覆岩离层注浆采空区自燃"三带"分布规律
"Three zones"rule of spontaneous combustion in goaf under overburden separation grout filling
摘要
Abstract
Overburden separation grout filling(OSGF)technology compacts the fragmented rock mass in the goaf and changes the seepage characteristics and distribution of the"three zones"of spontaneous combustion in the goaf.In order to investigate the range of spontaneous combustion risks of residual coal in the goaf under the OSGF in the 22301 fully-mechanized caving face of the Tun-lan Coal Mine,based on a combination of field measurement and numerical simulation,accurate demarcation of the spontaneous combustion"three zones"in the goaf was carried out.A three-dimensional mathematical model of borehole porosity was also pro-posed to evaluate the influence of different OSGF borehole locations on the goaf airflow field.The results show that the modified three-dimensional mathematical model of porosity can better reflect the gas flow field in the goaf after OSGF,and the residual accur-acy of its simulation results is improved by 22%compared with the field measurement.Compared with the situation without OSGF,the danger of natural ignition in the goaf is effectively inhibited due to the compaction effect after OSGF.Meanwhile,the air leakage flow converges upward,resulting in an increase of oxygen concentration at higher positions in the caving zone of the goaf.The lay-out parameters of grouting holes will have an impact on the flow field of goaf,and the correlation degree is the spacing of holes,the number of holes and the influence radius of holes.关键词
覆岩离层注浆/采空区自燃/空隙率/注浆钻孔/数值模拟Key words
overburden separation grout filling/spontaneous combustion in goaf/void ratio/grouting drilling/numerical simulation分类
矿业与冶金引用本文复制引用
刘海东,刘彦池,林柏泉,刘厅..覆岩离层注浆采空区自燃"三带"分布规律[J].煤矿安全,2024,55(7):68-77,10.基金项目
国家自然科学基金资助项目(52004276) （52004276）
江苏省自然科学基金资助项目(BK20200636) （BK20200636）
江苏省研究生科研与实践创新计划资助项目(KYCX23_2848) （KYCX23_2848）
