首页|切顶留巷矸石帮围岩-支护体承压变形特征及控制技术

切顶留巷矸石帮围岩-支护体承压变形特征及控制技术

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切顶留巷矸石帮围岩稳定性直接影响留巷效果和后期留巷复用,为解决切顶留巷矸石帮围岩变形难题,采用现场调查、理论分析、工程试验等研究方法对矸石帮围岩-支护体承压变形特征进行研究.现场调查切顶留巷试验段,将矸石垮落过程中对挡矸支护体形成的载荷分为留巷初期矸石垮落的动载荷、留巷中期矸石缓慢压实的似静态载荷和留巷后期稳定以后的准静态载荷;建立矸石帮侧向压力计算模型,解算得到矸石帮侧向压力从顶板到底板呈现递增趋势,明晰矸石帮侧向压力与覆岩压力、矸石体内摩擦角、矸石碎胀系数、切顶高度和切顶角度的关系;建立留巷顶底板-挡矸支护体-矸石帮围岩相互作用关系的力学模型,研究挡矸支护体变形影响因素,得到挡矸支护体所受侧向压力是变形失稳启动内因;优化挡矸支护施工技术,增强单体支柱和组合U型钢的联动耦合支护效果.现场监测验证理论结果的可靠性,矸石帮控制效果表明优化后的技术方案使围岩变形得到有效控制.
Pressure bearing and deformation of the surrounding rock-support body and control technology on the gangue side in gob side entry retaining by roof cutting
Studies show that the stability of gangue side surrounding rock in gob side entry retaining by roof cutting affects the formation effectiveness and reusability of roadways.In this regard,various methods such as on-site investigations,theoretical analysis,and engineering experiments are widely employed to study the pressure bearing and deformation of the gangue side surrounding rock and support body.According to on-site investigations on the test section,the load formed on the gangue side support during the process of gangue collapse can be divided into dynamic load caused by the initial gangue collapse,analogous static load caused by slow compaction of gangue in the middle stage during the formation of roadway,and quasi static load originating from the stability in the later stage during the formation of roadway.A model was established to calculate the lateral pressure of the gangue side.The obtained results revealed that the lateral pressure of the gangue side increases from the roof to the floor.Then a correlation between the lateral pressure of the gangue side with the overlying rock pressure,internal friction angle of the gangue,gangue broken bulk coefficient,roof cutting height,and roof cutting angle was developed.A mechanical model was established to simulate interaction between the roof and floor of the roadway,the gangue side support,and the surrounding rock of the gangue side.The present study focuses on the influencing factors on the deformation of gangue side support and demonstrates that the lateral pressure on gangue side support was the internal cause of instability.Based on the obtained results,the construction of gangue side support was optimized and the linkage coupling support effect of single hydraulic prop and composite U-shaped steel was enhanced.The theoretical results were verified through on-site monitoring.The performance of the gangue side control demonstrated that the proposed optimized scheme effectively controls the surrounding rock deformation.

mining engineeringgob side entry retaining by roof cuttinggangue side surrounding rock-support bodylateral pressuredeformation of gangue side supportlinkage coupling support

许旭辉、何富连、翟文立、王德秋、李晓斌、宋佳宇、张亚江

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中国矿业大学(北京)能源与矿业学院,北京 100083

北京低碳清洁能源研究院煤炭开采水资源保护与利用全国重点实验室,北京 102209

采矿工程 切顶留巷 矸石帮围岩-支护体 侧向压力 挡矸支护变形 联动耦合支护

国家自然科学基金资助项目国家留学基金资助项目

51974317202106430055

2024

10.13722/j.cnki.jrme.2023.0386

岩石力学与工程学报
中国岩石力学与工程学会

岩石力学与工程学报

CSTPCD北大核心
影响因子：2.589
ISSN：1000-6915
年,卷(期)：2024.43(2)
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