摘要
关键柱是采空区遗留煤柱群中最薄弱环节。关键柱的局部失稳可能导致遗留煤柱群的链式失稳。关键柱柱旁充填有望提高遗留煤柱群的整体稳定性,亟待开展关键柱柱旁充填防控遗留煤柱链式失稳的评价研究。选取元宝湾煤矿蹬空采动影响下柱式采空区遗留煤柱群为工程背景,通过FLAC~(3D)数值模拟软件研究蹬空开采过程中遗留煤柱群的稳定性变化和关键柱位置,分析不同宽度和高度关键柱柱旁双侧充填体对遗留煤柱群稳定性的影响。结果表明:蹬空开采过程中,遗留煤柱群中9-2煤柱率先失去了承载能力,可以视为关键柱;柱旁双侧充填体的宽度越大,关键柱能够分担越多的覆岩载荷与上行扰动载荷,邻近煤柱的应力集中程度随柱旁双侧充填体宽度的增大而降低;当柱旁双侧充填体高度与关键柱高度一致时,关键柱内部应力集中程度会明显降低;合理选取柱旁充填体的宽度和高度,能够有效提升遗留煤柱群整体稳定性。本研究有望为遗留煤柱群的链式失稳防控提供理论指导。
The key pillar is the weakest bearing structure among the residual coal pillars in the room-and-pillar gob.Unstable key pillar may lead to chain failure of residual coal pillars in the adjacent area.It is significant to investigate the effect of key pillar-side backfilling on preventing chain failure of pillar system since it is proposed to enhance the stability of residual coal pillars.The upward mining process of 6 coal seam above pllar mined-out area in Yuanbaowan coal mine is selected as the engineering back-ground.The key pillar location and stability variation is studied by FLAC3D numerical simulation soft-ware.The influences of key pillar-double backfilling body's width and height on the stability of residual coal pillars are analyzed.The results show that:9-2 coal pillar,as the key pillar,loses its bearing ca-pacity in the residual pillar system during the upward mining process;the wider key pillar-double backfilling body is,the more overburden load and mining disturbance it can carry.Stress concentration degree of adjacent coal pillar decreases with the increasing of key pillar-side backfilling body's width;when the backfilling body's height is consistent with that of key pillar,the stress concentration degree of key pillar would be significantly reduced;the appropriate selection of pillar-side backfilling body's width and height can effectively improve the stability of residual coal pillars.The study is expected to provide theoretical guidance for preventing the chain failure of residual coal pillars.
作者
冯国瑞
马俊彪
白锦文
朱卫兵
毋晧田
FENG Guorui;MA Junbiao;BAI Jinwen;ZHU Weibing;WU Haotian(School of Mining Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;Key Laboratory of Shanxi Province for Mine Rock Strata Control and Disaster Prevention,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering,Taiyuan,Shanxi 030032,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5期945-956,共12页
Journal of Mining & Safety Engineering
基金
国家杰出青年科学基金项目(51925402)
国家自然科学基金项目(52174125)
山西浙大新材料与化工研究院研发项目(2022SX-TD010,2021SX-TD001)。
关键词
关键柱柱旁充填
遗留煤柱群稳定性
上行开采
充填宽度
充填高度
key pillar-side backfilling
stability of residual coal pillars
upward mining
backfilling width
backfilling height
