›› 2017, Vol. 38 ›› Issue (11): 3106-3112.doi: 10.16285/j.rsm.2017.11.004

• 基础理论与实验研究 • 上一篇    下一篇

基于界面滑移脱黏的锚杆合理锚固长度研究

李怀珍1, 2,李学华1   

  1. 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
  • 收稿日期:2016-10-24 出版日期:2017-11-10 发布日期:2018-06-05
  • 作者简介:李怀珍,男,1977年生,讲师,博士研究生,主要从事矿山压力与岩层控制方面的教学与研究工作。
  • 基金资助:

    国家自然科学基金项目(No. 51474208);河南省高校深部矿井建设重点学科开放实验室开放基金(No. 2014KF-04)

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

LI Huai-zhen1, 2, LI Xue-hua1   

  1. 1. School of Mines, State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China; 2. Opening Laboratory for Deep Mine Construction, Henan Polytechnic University, Jiaozuo, Henan 454000, China
  • Received:2016-10-24 Online:2017-11-10 Published:2018-06-05
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (51474208) and the Open Foundation of Deep Mine Construction Laboratory in Henan Province (2014KF-04).

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。

关键词: 煤巷锚杆, 非全长锚固, 树脂黏结, 锚固剂-围岩界面, 滑移脱黏, 合理锚固长度

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.

Key words: coal roadway bolt, non-full length anchorage, resin binding, anchoring agent-surrounding rock interface, slip debonding, reasonable anchorage length

中图分类号: 

  • TD 263.5+6

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