›› 2017, Vol. 38 ›› Issue (S1): 27-35.doi: 10.16285/j.rsm.2017.S1.003

• 基础理论与实验研究 • 上一篇    下一篇

锚杆锚固对节理岩体剪切性能影响试验研究及机制分析

刘泉声1,2, 雷广峰1,3, 彭星新1,3, 魏 莱1,3, 刘建平1,3, 潘玉丛1,3   

  1. 1.中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室,湖北 武汉 430071; 2.武汉大学 岩土与结构工程安全湖北省重点实验室,湖北 武汉 430072;3. 中国科学院大学,北京 100049
  • 收稿日期:2017-01-03 出版日期:2017-06-22 发布日期:2018-06-05
  • 通讯作者: 雷广峰,男,1990年生,博士,主要从事岩土工程锚杆锚固机理方面的研究工作。E-mail:gflei_whrsm@foxmail.com E-mail:liuqs@whrsm.ac.cn
  • 作者简介:刘泉声,男,1962年生,博士,研究员,博士生导师,主要从事岩石工程方面的教学与研究工作。
  • 基金资助:

    国家自然科学基金重点项目(No.41130742);国家自然科学基金面上项目(No.51474205)。

Experimental study and mechanism analysis of influence of bolt anchoring on shear properties of jointed rock mass

LIU Quan-sheng1, 2, LEI Guang-feng1, 3, PENG Xing-xin1, 3, WEI Lai1, 3, LIU Jian-ping1, 3, PAN Yu-cong1, 3   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province, Wuhan University, Wuhan, Hubei 430072, China; 3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-01-03 Online:2017-06-22 Published:2018-06-05
  • Supported by:

    This work was supported by the Key Project of the National Natural Science Foundation of China(41130742) and the Surface Project of the National Natural Science Foundation of China(51474205).

摘要: 为研究锚杆锚固对节理岩体剪切性能的影响规律及锚杆抗剪作用机制,开展不同锚杆倾角及不同法向应力作用下加锚节理岩体室内剪切试验研究,探究加锚节理岩体在法向力及剪切力作用下的变形和受力特征,对比分析节理岩体锚固前与锚固后的剪切变形规律,讨论锚杆倾角、节理面法向应力等因素对节理岩体抗剪性能的影响。试验结果表明,锚杆锚固能够有效地增加节理面的黏聚力和内摩擦角,提高节理岩体的抗剪强度;锚杆倾角对加锚节理岩体的抗剪强度及剪切变形规律有重大影响,较大的锚杆倾角有利于发挥锚杆的“销钉”抗剪作用;节理岩体施加锚杆后其剪力–位移曲线存在弹性阶段、屈服阶段及塑性变形阶段3个区段;在锚杆倾角相同的条件下加锚节理岩体的抗剪强度随节理面法向应力的增加而增大。分析试验后试件破坏形态可知,加锚节理岩体中锚杆的屈服破坏主要发生在节理面附近的区段,岩体材料由于锚杆横向的挤压作用,也会在节理面附近发生局部破坏现象。

关键词: 锚杆锚固, 节理岩体, 剪切性能, 试验研究

Abstract: The indoor shear tests of anchored jointed rock mass under different bolt angles and different normal stresses are carried out to study the law and the shear resistance mechanism of bolt anchoring on shear properties of jointed rock mass. The deformation and stress characteristics of anchored jointed rock mass under the action of normal and shearing force are explored; the shear deformation law of the jointed rock mass before and after anchoring is compared and analyzed; and the effects of bolt angle, normal stress of the joint surface and other factors on the shear resistance of jointed rock are discussed. The experimental results show that the shear strength of jointed rock mass can be greatly improved by bolt anchoring as the increase of the cohesive force and internal friction angle after bolting; the bolt angle has significant influence on the shear strength and shear deformation of the anchored jointed rock mass; and the larger bolt angle is helpful to mobilize the shear resistance of the bolts. The shear-displacement curves of the jointed rock mass have three segments after anchoring, i.e. the elastic stage, the yield stage and the plastic deformation stage. The shear strength of anchored jointed rock mass is improved with the increase of the normal stress of joint plane under the same bolt angle. It is found that the yield failure of bolts in the jointed rock mass occurs mainly in the section near the joint plane; and the local damage of the rock material occurs near the joint plane due to the lateral compression of the bolts.

Key words: bolt anchoring, jointed rock mass, shear properties, experimental study

中图分类号: 

  • TU 452

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