摘要
以神东霍洛湾煤矿31106工作面为背景,考虑覆岩载荷的传递效应分析了煤柱群组合承载的稳定性,采用相似材料模拟方法探究工作面出集中煤柱进入房式煤柱过程中的强矿压显现机制。结果表明:下工作面出煤柱期间,层间岩层周期性垮落导致集中煤柱宽度逐渐减小,移动支承压力使得集中煤柱和房式煤柱组合动态承载;当集中煤柱减小到10 m仍未达到临界失稳宽度时,载荷传递导致前方1^(#)房柱载荷初始的5.28 MPa增加到7.58 MPa发生失稳,1^(#)房柱失稳后其上方的载荷转移到相邻的煤柱上,引起2^(#)、3^(#)、4^(#)煤柱相继失稳;上部坚硬岩层失去支撑后在房采区内超前断裂形成58 m的长悬顶,悬顶控制其上部岩层通过集中煤柱向下传递载荷。出集中煤柱5 m后,顶板切落产生剧烈的冲击扰动,应力快速由4 kPa增加到33.6 kPa,增长幅度高达740%,造成下工作面的强矿压显现。31106工作面在煤柱群下回采时,应超前采取爆破断顶或水力压裂切顶措施控制强矿压灾害。
Taking the 31106 working face of Huoluowan Coal Mine in Shendong Coalfield as the background,the stability of the combined bearing capacity of the coal pillar group under the overlying strata load transfer was analyzed,and the mechanism of strong mining pressure in the process of barrier coal pillar entering the room-pillars was explored using a similar material simulation method.The results show that during the period of the lower working face out of the barrier coal pillar,the width of the barrier coal pillar was gradually reduced due to the periodic collapse of the interlayer rock stratum.The abutment pressure resulted in the dynamic bearing of the combination of the barrier coal pillar and room-pillars.When the barrier coal pillar is reduced to 10 m and does not reach the critical instability width,the load transfer causes the load of the front 1^(#)room-pillar from 5.28 MPa to 7.58 MPa and finally to be instable.After the instability of the 1^(#)room-pillar,the load above is transferred to the adjacent coal pillars,causing the 2^(#),3^(#)and 4^(#)room-pillars to lose stability from one by another.After the upper hard rock layer loses support,a long hanging roof of 58 m was formed in the room mining area due to the advanced fracture control.The hanging roof controlled the upper rock layer to transfer load downward through the barrier coal pillar.After the 5m out of the concentrated coal pillar,the roof was cut off to produce intense shock disturbance,and the stress increased rapidly from 4 kPa to 33.6 kPa,with an increase of up to 740%,resulting in the manifestation of strong mining pressure in the lower working face.When the 31106 working face is mined under the upper coal pillar group,the roof blasting breaking or hydraulic fracturing roof cutting measures should be taken in advance to control the strong mine pressure disaster.
作者
吴文达
柏建彪
王襄禹
王天辰
王共元
WU Wenda;BAI Jianbiao;WANG Xiangyu;WANG Tianchen;WANG Gongyuan(College of Mining Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Xuzhou,Jiangsu 2221116,China;School of Mines,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2023年第3期563-571,577,共10页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(52204150,U21A20107)
山西省基础研究计划(自由探索类)青年研究项目(202103021223051)
山西省高等学校科技创新计划项目(2021L065)
太原理工大学青年基金项目(2022QN069)。
关键词
遗留煤柱群
载荷传递
煤柱失稳
覆岩破断
强矿压显现
residual coal pillars
overburden load transfer
stability of coal pillars
strata fracture
strong pressure behaviors
