Determination of rational anchorage length of bolt based on slip-debonding failure mode of interface

LI Huai-zhen; LI Xue-hua

doi:10.16285/j.rsm.2017.11.004

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Determination of rational anchorage length of bolt based on slip-debonding failure mode of interface

更新时间：2026-06-25

- Determination of rational anchorage length of bolt based on slip-debonding failure mode of interface
- Vol. 38, Issue 11, Pages: 3106-3112(2017)
- 作者机构：
  
  1. 中国矿业大学矿业工程学院深部煤炭资源开采教育部重点实验室,江苏,徐州,221116
  2. 河南理工大学深部矿井建设重点学科开放实验室,河南,焦作,454000
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2017.11.004
  CLC： TD263.5+6
- Online First：05 June 2018，
  
  Published：2017
- 稿件说明：
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LI Huai-zhen, LI Xue-hua. Determination of rational anchorage length of bolt based on slip-debonding failure mode of interface[J]. 2017, 38(11): 3106-3112.
DOI：

LI Huai-zhen, LI Xue-hua. Determination of rational anchorage length of bolt based on slip-debonding failure mode of interface[J]. 2017, 38(11): 3106-3112. DOI： 10.16285/j.rsm.2017.11.004.

摘要

为确定煤巷不同围岩条件下锚杆的合理锚固长度，基于锚固剂-围岩界面滑移脱黏失效模式，推导出弹性阶段锚杆极限承载力、界面剪应力分布计算公式。在分析锚固剂-围岩界面发生滑移脱黏发生条件基础上，提出既安全经济，又能充分发挥围岩可锚性和锚杆材质性能的锚杆合理锚固长度确定原则，分析了合理锚固长度的影响因素和设计流程。研究表明，锚杆弹性极限承载力主要受锚固剂-围岩界面抗剪强度影响，界面剪切刚度是临界锚固长度的关键控制因素。短锚拉拔试验测取的不同围岩条件下界面参数、，可为锚杆设计载荷、合理锚固长度设计提供指导。算例分析结果表明，基于锚固剂-围岩界面滑移脱黏设计的锚杆锚固长度与目前煤巷锚杆采用的锚固长度基本一致，验证了锚杆合理锚固长度计算方法与设计流程的可行性。

Abstract

This study aims to determine the reasonable anchorage length of the bolt in the roadway. Based on the slip-debonding failure mode of the interface between anchoring agent and surrounding rock

this paper deduced formulas of ultimate bearing capacity and interface shear stress distribution along the length of the bolt in the elastic stage. The safety and economy principle was also proposed for determining the reasonable anchorage length of anchors

according to the analysis of conditions of slipping and debonding at the interface between the anchors and the surrounding rock. The influencing factors on reasonable anchorage length and the design process were analysed as well. The results showed that the ultimate bearing capacity of bolts was mainly affected by the interface shear strength . Besides

the interface shear stiffness in the elastic deformation stage was the key control factor of the critical anchorage length. For different kinds of surrounding rock

the interface parameters and can be obtained through short anchor drawing test

which can provide guidance for the design of bearing capacity and reasonable anchorage length. A specific example was calculated and the obtained results agreed well with the results from practical engineering projects in coal roadway. Hence

it is proven that both the calculation method and the design process are feasible to determine reasonable anchorage length.

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