西安科技大学学报2024，Vol.44Issue(5)：866-879,14.DOI:10.13800/j.cnki.xakjdxxb.2024.0507
倾斜厚煤层覆岩瓦斯高渗区应力场-渗流场联动演化采高效应
Mining height effect of stress field-seepage field linkage evolution in gas high permeability zone of overlying strata in inclined thick coal seam
摘要
Abstract
There are many differences between the overall pressure characteristics of the mine after the mining of the inclined coal seam and the horizontal and near-horizontal coal seams.The high permea-bility area of the overlying strata and the evolution law of the cracks are also different,and the influence of the mining height of the coal seam is more obvious.A numerical simulation was performed to explore the evolution law of stress field-seepage field linkage in the high permeability zone of overlying strata in inclined thick coal seam.Taking the main mining face of the Liuhuanggou coal mine in Changji,Xin-jiang as the research object,the mining height effect of the fracture evolution law of overlying strata in inclined thick coal seam was studied,and the temporal and spatial evolution law of the high permeabili-ty zone of overlying strata under different mining heights was revealed.The results show that the over-burden stress field of inclined coal seam generally presents an asymmetric"butterfly"distribution with high stress at the lower end of goaf and low stress at the upper end.With the increase of coal seam min-ing height,the peak stress increases,and the influence range of mining pressure relief area also increa-ses.The gas high permeability area at the lower end of the goaf is mainly extended horizontally,and the one at the upper end of the goaf is mainly expanded vertically.In addition,the coupling effect of gas seepage field change and stress failure caused by coal seam mining to form more gas migration channels is the reason for the change of mining gas seepage pressure,and the high gas permeability area is the key area to block gas and control gas penetration.Therefore,to arrange the gas extraction system in the gas high permeability area could reduce the gas concentration of the whole mining fracture field to the greatest extent,and effectively control the risk of abnormal gas concentration during production.关键词
倾斜厚煤层/卸压瓦斯高渗区/联动演化/采高效应Key words
inclined thick coal seam/high permeability zone of pressure relief gas/linkage evolution/mining height effect分类
矿业与冶金引用本文复制引用
赵泓超,赵鹏翔,许永刚,张文进,卓日升..倾斜厚煤层覆岩瓦斯高渗区应力场-渗流场联动演化采高效应[J].西安科技大学学报,2024,44(5):866-879,14.基金项目
国家自然科学基金项目(52174205) （52174205）
陕西省杰出青年科学基金项目(2023-JC-JQ-40) （2023-JC-JQ-40）
国家重点研发专项项目(2023YFC3009004) （2023YFC3009004）
陕西省教育厅重点项目(22JY040) （22JY040）
新疆维吾尔自治区重点研发任务专项项目(2022B01034-3) （2022B01034-3）
新疆煤炭资源绿色开采教育部重点实验室开放课题项目(KLXGY-KA2404) （KLXGY-KA2404）
