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Anchoring effect and energy-absorbing support mechanism of large deformation bolt

大变形锚杆锚固效应及防冲吸能支护机理

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Abstract

To research the anchoring effect of large deformation bolt, tensile and drawing models are established. Then, the evolution laws of drawing force, bolt axial force and interfacial shear stress are analyzed. Additionally, the influence of structure element position on the anchoring effect of large deformation bolt is discussed. At last, the energy-absorbing support mechanism is discussed. Results show that during the drawing process of normal bolt, drawing force, bolt axial force and interfacial shear stress all gradually increase as increasing the drawing displacement, but when the large deformation bolt enters the structural deformation stage, these three values will keep stable; when the structure element of large deformation bolt approaches the drawing end, the fluctuation range of drawing force decreases, the distributions of bolt axial force and interfacial shear stress of anchorage section are steady and the increasing rate of interfacial shear stress decreases, which are advantageous for keeping the stress stability of the anchorage body. During the working process of large deformation bolt, the strain of bolt body is small, the working resistance is stable and the distributions of bolt axial force and interfacial shear stress are steady. When a rock burst event occurs, the bolt and bonding interface cannot easily break, which weakens the dynamic disaster degree.

摘要

大变形锚杆支护是冲击地压灾害防治的重要手段之一, 为研究大变形锚杆拉伸及锚固特征, 建立了大变形锚杆拉伸及拉拔数值模型, 研究了拉拔力、 锚杆轴力和锚固段界面剪应力演化规律, 分析了结构元件设计位置对其锚固效应的影响, 探讨了大变形锚杆防冲吸能支护机理. 结果表明: 普通锚杆在拉伸或拉拔过程中, 拉拔力、 锚杆轴力和锚固段界面剪应力均随着位移的增加而不断增大, 但大变形锚杆进入结构变形阶段后, 拉拔力、 锚杆轴力和锚固段界面剪应力会处于相对稳定状态, 尤其是锚固段锚杆轴力及界面剪应力分布会保持稳定; 大变形锚杆的结构元件越靠近拉拔端, 拉拔力波动幅度越小、 自由段锚杆轴力分布越稳定、 锚固段界面剪应力增速越小, 更利于锚固体受力稳定. 在大变形锚杆工作过程中, 不仅锚杆本身应变很小和工作阻力相对稳定, 而且锚杆轴力和锚固段界面剪应力分布相对稳定, 当围岩发生冲击破坏时, 锚杆不易被拉断或粘结界面不易破坏, 可更有效地吸收围岩释放的弹性变形能, 降低冲击地压灾害程度.

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Authors and Affiliations

  1. College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, 266590, China

    Tong-bin Zhao  (赵同彬), Ming-lu Xing  (邢明录) & Wei-yao Guo  (郭伟耀)

  2. State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China

    Tong-bin Zhao  (赵同彬), Ming-lu Xing  (邢明录) & Wei-yao Guo  (郭伟耀)

  3. Shandong Energy Group Co., Ltd., Jinan, 250014, China

    Cun-wen Wang  (王存文)

  4. Beijing Haohua Hongqingliang Co., Ltd., Ordos, 014316, China

    Bo Wang  (王博)

Authors
  1. Tong-bin Zhao  (赵同彬)
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  2. Ming-lu Xing  (邢明录)
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  3. Wei-yao Guo  (郭伟耀)
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  4. Cun-wen Wang  (王存文)
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  5. Bo Wang  (王博)
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Contributions

ZHAO Tong-bin provided the concept and helped revising the draft of manuscript. GUO Wei-yao wrote and edited the draft of the manuscript. XING Ming-lu finished the numerical simulation. WANG Cun-wen helped revising the draft of manuscript. WANG Bo provided the field data.

Corresponding author

Correspondence to Wei-yao Guo  (郭伟耀).

Ethics declarations

ZHAO Tong-bin, XING Ming-lu, GUO Wei-yao, WANG Cun-wen and WANG Bo declare that they have no conflict of interest.

Additional information

Foundation item: Project(2019SDZY02) supported by the Major Scientific and Technological Innovation Project of Shandong Provincial Key Research Development Program, China; Project(51904165) supported by the National Natural Science Foundation of China; Project(ZR2019QEE026) supported by the Shandong Provincial Natural Science Foundation, China

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Zhao, Tb., Xing, Ml., Guo, Wy. et al. Anchoring effect and energy-absorbing support mechanism of large deformation bolt. J. Cent. South Univ. 28, 572–581 (2021). https://doi.org/10.1007/s11771-021-4622-0

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  • DOI: https://doi.org/10.1007/s11771-021-4622-0

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