矿业科学学报2025，Vol.10Issue(6)：1055-1067,13.DOI:10.19606/j.cnki.jmst.2025061
薄煤层工作面低洼段停采诱发顶板关键层浸水破断失稳机理
The instability mechanism of water immersion fracture of key strata of roof in low-lying section induced by stopping mining in thin coal seam working face
摘要
Abstract
This study aims to address roof support crushing and water gushing caused by the stoppage of thin coal seam working face in low-lying section.With 1599 working face of Xuyong No.1 Coal Mine as the subject of research,this study conducted theoretical analysis,physical similarity simulation,nu-merical simulation and field measurement to investigate the development patterns of overburden rock cracks before and after stopping mining and analyze the fracture instability type and mechanical mecha-nism of key strata after its extension to the aquifer.Results indicate that the roof above the low-lying segments of the coal seam is basically in a water-rich state at a depth of 0～40 meters.Before the work-ing face enters the low-lying section in mining,the sub-key strata 1 and 2 break sequentially and form a stable beam structure,with the overburden fractures mainly consisting of separation fractures.After the working face enters the low-lying section and stops mining,the separation fractures in the overbur-den strata continue to develop laterally,while the vertical fractures develop to communicate with the Changxing limestone aquifer,forming a complete water inrush channel.The water-affected sub-key strata 1 and 2 exhibit shorter periodic fracture distance and higher development height of the caving zone and fracture zone.Therefore,after the working face enters the low-lying section for mining,the fracture of sub-key stratum 2 and subsequent sliding instability are triggered by insufficient support force of the supports,slow advancing speed,and water deterioration of sub-key stratum 2.This leads to roof caving and water inrush in the 1599 working face.In this light,this study proposes a combined control scheme of medium-deep hole grouting and advanced drainage for the roof strata of the low-lying section in the 1599 working face.关键词
起伏煤层/薄煤层/灰岩富水层/关键层侵蚀/顶板压架Key words
fluctuating coal seam/thin coal seam/water-rich layer of limestone/key stratum erosion/roof pressure frame分类
矿业与冶金引用本文复制引用
李季,强旭博,伍永平,彭博,董继辉,闫博,郑英建,陈忠..薄煤层工作面低洼段停采诱发顶板关键层浸水破断失稳机理[J].矿业科学学报,2025,10(6):1055-1067,13.基金项目
陕西高校青年创新团队 （）
