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Volume 40 Issue 5
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LIU Quan-sheng, LEI Guang-feng, PENG Xing-xin, WEI Lai. Shearing mechanical model and experimental verification of bolts in jointed rock mass[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(5): 794-801. DOI: 10.11779/CJGE201805003
Citation: LIU Quan-sheng, LEI Guang-feng, PENG Xing-xin, WEI Lai. Shearing mechanical model and experimental verification of bolts in jointed rock mass[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(5): 794-801. DOI: 10.11779/CJGE201805003
shu

Shearing mechanical model and experimental verification of bolts in jointed rock mass

  • 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;
    2. Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province, Wuhan University, Wuhan 430072, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China

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  • Revised Date: March 13, 2017
  • Published Date: May 24, 2018
    Graphical Abstract
    • Abstract
  • Based on the principle of the minimum residual energy, the relationship between the horizontal shear displacement of the joint surface and the axial and tangential deformation of the bolt is analyzed considering the shear deformation of the bolts in jointed rock mass. The judgment process of the yield mode of the bolt is determined by analyzing the characteristics of the loading on the bolts. The formula for calculating the shear strength of the anchoring joint surface is established considering the equivalent shearing area, and the accuracy of the theoretical calculation is verified by the indoor physical experiments. The influence of bolt inclination, surrounding rock strength, bolt diameter and normal stress on the shear strength of the anchoring joint surface is discussed. The results show that the shearing mechanical model can better reflect the contribution of the axial force and shearing force of the bolts to the shear strength of the joints. The calculated results of the shear strength of the anchoring joint surfaces considering the equivalent shearing area are in good agreement with the experimental ones. The greater the inclination of the bolts and the strength of the surrounding rock, the smaller the axial force of the bolts but the greater the shear force. The axial force and shear force of the bolts will increase with the increase of the diameter of the bolts. The normal stress of the joint surface will significantly affect the dilatancy effect, and the greater the normal stress, the higher the shear strength of the joint.
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    • References (18)
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