摘要
针对深井沿空巷道围岩变形量大、维护困难等难题。以某矿7312轨道巷道为研究背景,采用现场调研、理论分析、数值模拟、工程实践等研究手段,分析了深井沿空巷道围岩变形破坏特征及其原因,基于莫尔应力圆分析模型,剖析了沿空巷道服役期间围岩应力分布及演化过程,明确了深井沿空巷道围岩变形破坏的主要影响因素,阐述了深井沿空巷道立体式卸压防控原理,验证了深井沿空巷道立体式卸压防控原理的有效性,提出了以“应力主动干预”为核心思想的深井沿空巷道立体式卸压防控技术。研究表明:①沿空巷道服役期间围岩变形破坏的主要因素包括高静载、采动应力、岩块B回转、巷道支护强度、围岩力学性质、围岩卸压效果等。②沿空巷道立体式卸压防控体系最佳实施时机应在沿空巷道支护后或未受采动影响阶段,实施对象为岩块B、实体煤上方坚硬顶板、实体煤应力集中区。③现场工程实践表明深井沿空巷道立体式卸压防控技术体系能够降低岩块B与沿空巷道之间的应力传导,阻隔和弱化采动应力影响,转移巷道围岩集中应力,改善沿空巷道应力环境。
In response to the challenges posed by significant deformation and maintenance difficulties in the surrounding rock of deep gobside entries.This study focuses on the 7312 head entry as the research background.The deformation and failure characteristics of the surrounding rock in deep gob-side entries and their underlying causes were analyzed through a combination of field research,theoretical analysis,numerical simulations,and engineering practices.By employing the Mohr stress circle model,the stress distribution and evolution process of the surrounding rock in a deep gob-side entry during the service period were examined.The primary factors contributing to the deformation and failure of the surrounding rock in deep gob-side entries were identified.Furthermore,the principle of three-dimensional pressure relief and prevention in deep gob-side entries was elucidated and its effectiveness was validated.A three-dimensional pressure relief and prevention technology system for deep gob-side entries,with as the core,was proposed.The study findings suggest that:①Key factors leading to the deformation and failure of the surrounding rock in deep gob-side entries encompass high static loads,mining-induced stresses,rotation of rock block B,support strength for the roadway,mechanical properties of the surrounding rock,and the efficacy of rock pressure relief.②The optimal timing for implementing the three-dimensional stress relief and control system in deep gob-side entries should be after supporting the gob-side entry or during phases unaffected by mining activities.The implementation targets include rock block B,the hard roof above the solid coal,and stress-concentrated areas in the solid coal.③Field engineering applications have demonstrated that the three-dimensional pressure relief and prevention technology system for deep gob-side entries can mitigate stress transmission between rock block B and gob-side entry,reduce the impact of mining stress,transfer concentrated stress from the surround-ing rock.
作者
杨尚
宁建国
李学慧
李长青
王俊
史新帅
张朝辉
YANG Shang;NING Jianguo;LI Xuehui;LI Changqing;WANG Jun;SHI Xinshuai;ZHANG Zhaohui(College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China;College of Transportation,Shandong University of Science and Technology,Qingdao 266590,China;Shandong Energy Group Lu xi Minging Co.,Ltd.,Yuncheng 274700,China;Shandong Kangge Energy Technology Co.,Ltd.,Jinan 250200,China;Shandong Energy Group Science and Technology Develop Co.,Ltd.,Jinan 250200,China)
出处
《煤炭科学技术》
北大核心
2025年第8期169-186,共18页
Coal Science and Technology
基金
国家自然科学基金资助项目(52374130,52074170,52204100)。
关键词
深井
沿空巷道
围岩
卸压
防控
deep coal mine
gob-side entry
surrounding rock
pressure relief
control
