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Shear Performance of Rock Joint Reinforced by Fully Encapsulated Rock Bolt Under Cyclic Loading Condition

  • Xuezhen Wu
  • Yujing JiangEmail author
  • Bin Gong
  • Zhenchang Guan
  • Tao Deng
Original Paper
  • 107 Downloads

Abstract

The shear performance of bolted rock joints under cyclic loading condition was studied through laboratory shear tests. The tests were performed on a cyclic shear testing apparatus. The fully encapsulated rock bolts were inserted in the rock joints. The upper block was fixed in the horizontal direction, and the cyclic shear load was applied laterally on the lower block. A total of 16 shear tests were conducted for two types of rough joints. The results showed that the failure mode of rock bolts in cyclic shear test was different with the case of direct shear test. When the cyclic displacement was small, the rock bolt played a very small role in the second-to-fifth cycles, the rock bolt remained unbroken during cyclic shearing. The shear resistance of the rock bolt would gradually recover after the shear displacement has exceeded the cyclic displacement in the termination cyclic after five cycles. When the cyclic displacement was large, the rock bolt broke during cyclic shearing, and the shear resistance could not be recovered in the termination cyclic. It is indicated that the rock bolt had completely lost its supporting role after cyclic shear loading. The shear strength reduction of bolted joints under the cyclic loading condition was much significant compared to the un-bolted joints. Therefore, the influence of cyclic loading on the shear resistance of the rock bolt was much larger than its counterpart of the rock joint itself. These results showed that the shear performance of a rock bolt inserted in a rock joint was strongly influenced by cyclic shear loading.

Keywords

Rock bolt Cyclic shear loading Laboratory test 

Notes

Acknowledgements

The author would like to thank Prof. R. Sterling from Louisiana Tech University for his critical suggestions during his visit to our laboratory and his careful revision of the manuscript. This study was funded by the Natural Science Foundation of China (no. 51379117). Data for this paper are available by contacting the corresponding author at Jiangyjcn@gmail.com.

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  • Xuezhen Wu
    • 1
  • Yujing Jiang
    • 1
    • 2
    • 3
    Email author
  • Bin Gong
    • 3
  • Zhenchang Guan
    • 1
  • Tao Deng
    • 1
  1. 1.College of Civil EngineeringFuzhou UniversityFuzhouChina
  2. 2.State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and TechnologyShandong University of Science and TechnologyQingdaoChina
  3. 3.Graduate School of EngineeringNagasaki UniversityNagasakiJapan

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