Experimental study of reinforced effect of bolt in 3D surface fractured specimens under uniaxial compression

ZHANG Ning; LI Shu-cai; LI Ming-tian; Lü Ai-zhong

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Experimental study of reinforced effect of bolt in 3D surface fractured specimens under uniaxial compression

更新时间：2026-06-25

- Experimental study of reinforced effect of bolt in 3D surface fractured specimens under uniaxial compression
- Vol. 32, Issue 11, (2011)
- 作者机构：
  
  1. 华北电力大学水电与岩土工程研究所,北京,102206
  2. 山东大学岩土与结构工程研究中心,济南,250061
  3. 山东交通学院土木工程学院,济南,250023
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU452
- Online First：09 November 2011，
  
  Published：2011
- 稿件说明：
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ZHANG Ning, LI Shu-cai, LI Ming-tian, et al. Experimental study of reinforced effect of bolt in 3D surface fractured specimens under uniaxial compression[J]. 2011, 32(11).
DOI：

ZHANG Ning, LI Shu-cai, LI Ming-tian, et al. Experimental study of reinforced effect of bolt in 3D surface fractured specimens under uniaxial compression[J]. 2011, 32(11). DOI：

摘要

在岩石相似材料试件中设置三维表面裂隙，制作不同锚固方式的试件，对其进行单轴压缩试验，研究锚杆对试件强度以及预置裂隙扩展模式的影响。试验结果表明，与无锚试件相比，4种加锚试件的抗压强度和压缩弹性模量均有不同程度的提高，而且锚杆对压缩弹性模量的增强效果比对抗压强度的增强效果更显著。4种加锚试件的残余强度大体相等，比无锚试件的残余强度提高了2.0～2.5倍。加锚试件的破坏过程大致分4个阶段：孔隙裂隙压密阶段、弹性变形至微弹性裂隙发展阶段、非稳定破坏阶段和破裂后阶段，试件表面宏观裂纹均出现在破裂后阶段。由于锚杆的加固止裂作用，预置裂隙的扩展模式发生变化，加锚试件内部出现了弧形破裂面和剪切薄弱面。试验中共出现3种裂纹：张拉裂纹、剪切裂纹和拉剪复合裂纹。

Abstract

Three-dimensional surface fracture is set in specimens composed of rock similar material. In order to get the effect of bolts on strength and propagation mode of the pre-existing fracture

uniaxial compression tests are carried out on specimens with different anchorage modes. The results show that

comparing with the specimens without bolts

compressive strength and compression modulus of reinforced specimens increase in different degrees. Compression modulus of reinforced specimen is enhanced more significantly than compressive strength. Residual strengths of four types of reinforced specimens are approaching to each other with the value being about 3 to 3.5 times that of specimen without bolt. The failure process of anchored specimen is divided into four phases: ① initial fracture compression phase; ② micro-fractures developing phase; ③ unsteady failure phase; ④ post-failure phase. And the surface macro-fractures all appear in the post-failure phase. Due to the reinforced and crack arresting effect of bolts the mode of crack propagation changes. Curved fracture plane and low-shear-strength plane are found in the reinforced specimens. Three types of cracks are found in test

namely tensile crack

shear crack and tensile-shear mixed crack.

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