摘要
该研究介绍一种新型高阻大变形吸能锚杆。该锚杆通过独特的吸能结构设计,并结合注浆锚固工艺,可在高阻力状态下实现大变形并具备高吸能能力,对巷道围岩大变形展现出良好的适应性。为探究矿用螺纹钢锚杆吸能结构的工作性能,开展实验室试验。结果表明,矿用螺纹钢锚杆吸能结构呈现高阻大变形的工作特性,且随着吸能结构长度和围岩强度的增大,其稳定工作阻力增大。以100 mm长螺纹钢锚杆吸能结构为例,对高阻大变形吸能锚杆的工作性能展开理论分析,结果显示,吸能结构锚杆的高阻大变形可达米级,1000 mm自由段行程对应的吸能能力可达190 kJ/m。此外,对吸能结构螺纹钢锚杆的工作性能进行现场初步测试。结果表明,吸能结构锚杆的高阻大变形特性会因围岩和锚固状态的差异而有较大不同。裂隙围岩中吸能结构锚杆的拉拔力整体显著低于完整围岩中吸能结构锚杆的拉拔力。在完整围岩中,吸能结构锚杆在高阻工作阶段的拉拔力波动较大,这对锚杆的稳定工作不利。在锚杆杆体自由段增加塑料包裹层,是解决该问题的有效途径。
A novel high-resistance and large-deformation energy-absorbing bolt is introduced in this study.Through the design of special energy-absorbing structure combined with grouting technology,the bolt can achieve large deformation and high energy absorption in a high-resistance state,thereby exhibiting excellent adaptability to severe deformation in roadway surrounding rock.First,laboratory tests were conducted to evaluate the performance of the energy-absorbing structure of the mining threaded steel bolt,and the results suggest that that its energy-absorbing structure demonstrates high-resistance and large-deformation characteristics.Moreover,with the increase of energy-absorbing structure length and surrounding rock strength,the stable working resistance of the energy-absorbing structure grows accordingly.Then,the working performance of the high-resistance and large-deformation energy-absorbing bolt was theoretically analyzed by taking the energy-absorbing structure of a 100-mm-long mining threaded bolt as an example.It was found that the high-resistance and large-deformation capacity of the energy-absorbing bolt can reach meter-scale dimensions,with an energy absorption capacity of up to 190 kJ/m corresponding to a 1 oo0 mm free section.Preliminary field tests were performed to assess the working performance of the threaded bolt with an energy-absorbing structure.The results show that its high-resistance and large-deformation characteristics vary noticeably with the surrounding rock and anchoring states.The pullout force of the energy-absorbing bolt in fractured surrounding rock is much lower than that in intact surrounding rock.The pullout force of the energy-absorbing bolt in intact surrounding rock fluctuates greatly in the high-resistance working stage,which is inconducive to the stable performance of the bolt.An effective solution to this issue is to add a plastic wrapping layer to the free section of the bolt.
作者
李许伟
张政华
金锋
盛世杰
骆宇
窦林名
马祥
贺虎
牟宗龙
LI Xuwei;ZHANG Zhenghua;JIN Feng;SHENG Shijie;LUO Yu;DOU Linming;MA Xiang;HE Hu;MU Zonglong(School of Mines,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;Jiangsu Engineering Laboratory of Mine Earthquake Monitoring and Prevention,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;China Coal Energy Xinjiang Tianshan Coal Power Co Ltd,Changji,Xinjiang 831215,China;Inner Mongolia Zhongtai Energy Co Ltd,Ordos,Inner Mongolia 017000,China;School of Resources and Geosciences,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)
出处
《采矿与安全工程学报》
北大核心
2025年第3期579-588,共10页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(52274147,51974302,52227901)
国家重点研发计划项目(2024YFC3013802)。
关键词
锚杆支护
吸能锚杆
吸能结构
大变形巷道
rock bolting
energy-absorbing bolt
energy-absorbing structure
roadway with large deformation
