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

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

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).

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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

CLC Number: 

  • TU 452

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