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Pullout Performances of Grouted Rockbolt Systems with Bond Defects

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Abstract

This paper presents a numerical study on the pullout behaviour of fully grouted rockbolts with bond defects. The cohesive zone model (CZM) is adopted to model the bond–slip behaviour between the rockbolt and grout material. Tensile tests were also conducted to validate the numerical model. The results indicate that the defect length can obviously influence the load and stress distributions along the rockbolt as well as the load–displacement response of the grouted system. Moreover, a plateau in the stress distribution forms due to the bond defect. The linear limit and peak load of the load–displacement response decrease as the defect length increases. A bond defect located closer to the loaded end leads to a longer nonlinear stage in the load–displacement response. However, the peak loads measured from the specimens made with various defect locations are almost approximately the same. The peak load for a specimen with the defects equally spaced along the bolt is higher than that for a specimen with defects concentrated in a certain zone, even with the same total defect length. Therefore, the dispersed pattern of bond defects would be much safer than the concentrated pattern. For the specimen with dispersed defects, the peak load increases with an increase in the defect spacing, even if the total defect length is the same. The peak load for a grouted rockbolt system with defects increases with an increases in the bolt diameter. This work leads to a better understanding of the load transfer mechanism for grouted rockbolt systems with bond defects, and paves the way towards developing a general evaluation method for damaged rockbolt grouted systems.

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Acknowledgements

This work was fully supported by the National Natural Science Fund of China (Nos. 51304067, 51674100 and 51774112) and partly supported by the Distinguished Young Scholars of Henan Polytechnic University (No. J2015-1) and the Program for Science and Technology Innovation Talents Universities of Henan Province (Project No. 18HASTIT017). We are grateful to the reviewers for their constructive comments on the paper.

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Authors and Affiliations

  1. Opening Laboratory for Deep Mine Construction, Henan Polytechnic University, Jiaozuo, China

    Chang Xu & Shuren Wang

  2. School of Civil Engineering, Henan Polytechnic University, Jiaozuo, China

    Chang Xu, Zihan Li & Lei Fu

  3. ARC Centre of Excellence for Geotechnical Science and Engineering, Civil, Surveying and Environmental Engineering, University of Newcastle, Callaghan, NSW, 2308, Australia

    Shanyong Wang

  4. Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian, China

    Chunan Tang

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  1. Chang Xu
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  2. Zihan Li
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  3. Shanyong Wang
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  4. Shuren Wang
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  5. Lei Fu
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Correspondence to Chang Xu.

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Xu, C., Li, Z., Wang, S. et al. Pullout Performances of Grouted Rockbolt Systems with Bond Defects. Rock Mech Rock Eng 51, 861–871 (2018). https://doi.org/10.1007/s00603-017-1373-1

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  • DOI: https://doi.org/10.1007/s00603-017-1373-1

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