摘要
针对千米深井近距离煤层沿空巷道,在深部高地应力及多次开采扰动影响下,出现强烈非线性大变形这一难题,以平煤四矿己_(16-17)-31020回风巷作为研究对象,首先综合运用理论分析与数值模拟方法,确定沿空巷道的煤柱宽度,并进一步分析己_(16-17)-31020回风巷失稳破坏的原因,揭示其围岩承载结构的形成机制,最终提出适用于己_(16-17)-31020回风巷的围岩控制技术。综合理论分析和数值模拟结果表明:综合考虑围岩应力水平与围岩破碎程度,己_(16-17)-31020回风巷合理的护巷煤柱宽度为6 m;己_(16-17)-31020回风巷围岩变形的应力驱动路径呈现为顶、底板变形引发巷帮失稳,而低预紧力和低锚固可靠性是导致该回风巷变形失稳的主要因素。依据己_(16-17)-31020回风巷失稳破坏原因及其锚固承载结构形成机制,提出“顶帮多级承载结构+损伤修复”的锚注联合支护技术。现场工业试验证实了该技术方案具备合理可靠性。
Gob-side roadways of closely spaced coal seams in kilometer-deep mines may undergo serious nonlinear deformation under the combined effects of high in-situ stress and multiple mining disturbances.In view of the above fact,this study took the F_(16-17)-31020 return airway in Pingdingshan No.4 Mine as the research object.Firstly,the width of the coal pillar for the gob-side roadway was determined by means of comprehensive theoretical analysis and numerical simulation.Afterwards,the causes for instability and failure of the Fi6-17-31020 return airway were further analyzed,and the formation mechanism of the anchoring bearing structure of its surrounding rock was revealed.Finally,a control technology for the surrounding rock of the F_(16-17)-31020 return airway was proposed.According to the comprehensive theoretical analysis and numerical simulation results,the reasonable width of the protective coal pillar for the F_(16-17)-31020 return airway is 6 m,considering both the stress level and the degree of surrounding rock fragmentation.The surrounding rock deformation of the F_(16-17)-31020 return airway follows a stress-driven path where roof and floor deformation triggers rib instability,and the main causes of deformation and instability in the F_(16-17)-31020 return airway are a low preload and poor anchoring reliability.Based on the causes of instability and failure of the F_(16-17)-31020 return airway and the formation mechanism of its anchoring bearing structure,a combined support technique of"multi-level bearing structure for roof and rib support+damage repair through bolt grouting"was proposed,and the rationality and reliability of this technical solution was verified through field industrial tests.
作者
李延河
荆升国
唐庆腾
LI Yanhe;JING Shengguo;TANG Qingteng(State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;School of Civil Engineering,Xuzhou University of Technology,Xuzhou,Jiangsu221018,China;China Pingmei Shenma Energy Chemical Group Co Ltd,Pingdingshan,Henan 467000,China)
出处
《采矿与安全工程学报》
北大核心
2025年第3期613-624,共12页
Journal of Mining & Safety Engineering
基金
国家重点研发计划项目(2017YFC0603001)。
关键词
千米深井
近距离开采
沿空掘巷
围岩控制
应力分布
kilometer-deep mine
closely spaced coal seam mining
gob-side roadway excavation
surrounding rock control
stress evolution
