复合扩管式锚索恒阻器的研发与试验研究
Development and experimental research of the cable bolt constant resistance device by using composite expansion pipe
贾后省 1张志明 2刘少伟 1王林 2江文渊 3彭博 4付孟雄1
作者信息
- 1. 河南理工大学能源科学与工程学院,河南焦作 454003;煤炭安全生产与清洁高效利用省部共建协同创新中心,河南焦作 454003
- 2. 河南理工大学能源科学与工程学院,河南焦作 454003
- 3. 山东大学机械工程学院,山东济南 250061
- 4. 四川川煤华荣能源有限责任公司,四川成都 610091
- 折叠
摘要
深部高应力、软弱围岩、强烈采动影响等条件下的巷道围岩频繁出现大变形,此类围岩大变形支护可控性普遍较差,常规锚索因其较低的延伸率无法适应巷道大变形而大量破断或锚固失效,导致巷道出现冒顶隐患.针对此类问题,研发了一种与常规锚索配合使用的复合扩管式恒阻器,其结构主要由止进端盖、扩径管、一体式托盘和锥式锁具组成,通过锥式锁具克服扩径管"扩胀—摩削"所产生的近似恒定的复合阻力,实现围岩大变形过程中的锚索支护阻力恒定,通过理论分析、数值模拟和静力拉伸试验等综合研究方法,系统分析和试验了复合扩管式恒阻器的力学特性和工作稳定性,掌握了该恒阻器扩径增量、锁具锥角对扩径管变形及恒阻器复合阻力的影响规律.试验结果表明:恒阻器复合阻力主要分为阻力快升段和近恒定阻力段 2个过程,且近恒定阻力段作为主要阶段达到试验全程的 85%～90%;锁具锥角、扩径增量直接影响了扩径管变形及恒阻器力学特性,锁具锥角小于 20°时,扩径管变形均匀且恒阻器复合阻力发挥稳定,而扩径增量则决定了恒阻器复合阻力的大小,可通过调整扩径增量获取需要的锚索恒阻力;ϕ17.8 mm锚索条件下,当锁具锥角为 15°、扩径增量为 5mm时,恒阻器恒定阻力约为 265.92 kN,ϕ21.8 mm锚索条件下,当锁具锥角为 15°,扩径增量为 8mm时,恒阻器恒定阻力约为 424.15 kN,且工作状态稳定可靠,可较好的符合大变形巷道的恒阻支护要求.此外,该恒阻器还具有工作稳定性强、恒阻行程及阻力可调、结构简单、安装便捷等特点,是大变形巷道围岩控制技术的有效补充.
Abstract
Under the conditions of deep high stress,weak surrounding rock,and strong mining influence,the surrounding rock of deep-buried roadway frequently experiences large deformations,the controllability of large deformation support for this type of surrounding rock is generally poor,and the conventional anchor bolts often break or fail to anchor due to their low elongation rate,which cannot adapt to the large deformation of the roadway,resulting in the risk of roof caving in the roadway.The constant resistance device by using composite expansion pipe(CRD-cep)used in conjunction with cable bolt has been invented.The main structures include a stop end cover,an expansion pipe,an integrated tray and a conical lock.The conical lock overcomes the approximately constant composite resistance generated by the"expansion grinding"of the expanding pipe,thus,the constant resistance of the cable bolt during the large deformation process of the surrounding rock is achieved.The mechanical characteristics and working stability of the resistance stabilizer are im-proved by theoretical analysis,numerical simulation and static tensile testing and other comprehensive research methods,and the influence of the expansion increment and lock cone angle of the composite expansion tube constant resistance device on the deformation of the expansion pipe and the composite resistance of the CRD-cep has been understood.The test results indicate that the composite resistance of the CRD-cep is mainly divided into two processes:the fast rising res-istance stage and the near constant resistance stage,and the nearly constant resistance section as the main stage reaches 85%to 90%of the entire test process.The lock cone angle and expansion increment directly affect the deformation of the expansion pipe and the mechanical characteristics of the CRD-cep.When the lock cone angle is less than 20°,the deform-ation of the expanding pipe is uniform and the composite resistance of the CRD-cep is stable.The expanding increment determines the size of the CRD-cep.The required constant resistance of the cable bolt can be obtained by adjusting the ex-panding increment.When the diameter of the anchor rope used is 17.8 mm,the lock cone angle is 15°and the expansion increment is 5 mm,the constant resistance of the CRD-cep is about 265.92 kN,when the diameter of the anchor rope used is 21.8 mm,the lock cone angle is 15°and the expansion increment is 8 mm,the constant resistance of the CRD-cep is about 424.15 kN,and the working state is stable and reliable,which can better meet the constant resistance support re-quirements of large deformation roadway.The CRD-cep has the characteristics of strong working stability,adjustable con-stant resistance stroke and resistance,simple structure,and convenient installation,which is an effective supplement to the control technology of surrounding rock in large deformation roadway.
关键词
大变形巷道/复合扩管/锚索恒阻/拉伸试验Key words
large deformation roadway/composite expansion pipe/cable bolt constant resistance/tensile test引用本文复制引用
基金项目
中原英才计划中原青年拔尖人才项目(2021)()
河南省高等学校科技创新人才资助计划(22HASTIT010)
国家自然科学基金(52074102)
出版年
2024
NETL
NSTL
万方数据