Centrifugal Model Tests on Anchorage Mechanism of Rockbolts Considering Tensile-Lateral Shearing Coupled Effect

  • Fei-fan Ren
  • Zhuang Li
  • Guan Wang
  • Qi-hua Zhao
Conference paper


Bamboo-steel composite rockbolt (BSCR) has been used in many earthen site protection projects, however, there is little study on anchorage behavior of BSCR in real stress field. Due to the large diameter of BSCR, it can bear the tensile-lateral shearing coupled effect in engineering practices of reinforcing earthen sites. The purpose of this paper is to study the anchorage mechanism, deformation characteristics and failure modes of BSCR by the means of centrifugal model tests. In this study, two kinds of rockbolts were employed to reinforce soil slopes, one is organic glass rockbolt, which is rigorously scaled from BSCR basing on Buckingham π-theorem, the other is steel wire rockbolt, which can only provide the axial reinforcing effect, they have the same axial stiffness but different bending stiffness. On that basis, the distribution and evolution laws of axial stress/strain, bending moment etc. with the change of load were compared and analyzed. The influence of anchorage layers and stiffness on the anchorage performance was also discussed. The results show that the axial stess and the bending moment increase with the increase of the load. Besides, the rockbolts with a certain bending stiffness can improve the slope stability, so the anti-bending capacity of rockbolts should be considered. Furthermore, 2 layers of organic glass rockbolts can bear bigger load, and the failure mode is progressive failure of top-down. The output from this research will provide theoretical basis for the effective and optimal use of BSCR for the conservation of earthen sites.


Bamboo-steel composite rockbolt Centrifugal model test Tensile-lateral shearing coupled effect Anchorage performance 



This study was supported by National Natural Science Foundation of China (41302221), Research Fund for the Doctoral Program of Higher Education of China (20120072120033), the Fundamental Research Funds for the Central Universities (20140800, 22120170133), Opening fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (SKLGP2017K020) and National Key Research and Development Plan (2016YFE0105800).


  1. 1.
    Ren, F.: Study on the Anchorage Mechanics of the Bamboo-steel composite rockbolts. Lanzhou University (2009)Google Scholar
  2. 2.
    Sun, M., Li, Z., Wang, X., et al.: Study on reinforcement of earthen sites by bamboo-steel composite anchor. Chin. J. Rock Mech. Eng. S2, 3381–3385 (2008)Google Scholar
  3. 3.
    Spang, K., Egger, P.: Action of fully-grouted bolts in jointed rock and factors of influence. Rock Mech. Rock Eng. 23(3), 201–229 (1990)CrossRefGoogle Scholar
  4. 4.
    Ma, S., Nemcik, J., Aziz, N.: An analytical model of fully grouted rock bolts subjected to tensile load. Constr. Build. Mater. 49(1), 519–526 (2013)CrossRefGoogle Scholar
  5. 5.
    Nakamoto, S., Seki, S., Iwasa, N., et al.: A centrifuge model study on a slope reinforced by rock bolts with prestressed facing plate. Japan. Geotech. Soc. Spec. Publ. 2(26), 948–952 (2016)Google Scholar
  6. 6.
    Song, Z., Hu, Y., Loughlin, O., et al.: Loss in anchor embedment during plate anchor keying in clay. J. Geotech. Geoenviron. Eng. 135(10), 1475–1485 (2009)CrossRefGoogle Scholar
  7. 7.
    Davies, M.C.R.: The Performance of Soil Nailed Systems, pp. 107–121 (2010). Leung, C.F., Chu, J., Shen, R.F.Google Scholar
  8. 8.
    Chen, J., Saydam, S., Hagan, P.C.: An analytical model of the load transfer behavior of fully grouted cable bolts. Constr. Build. Mater. 101, 1006–1015 (2015)CrossRefGoogle Scholar
  9. 9.
    Li, X., Nemcik, J., Mirzaghorbanali, A., et al.: Analytical model of shear behaviour of a fully grouted cable bolt subjected to shearing. Int. J. Rock Mech. Min. Sci. 80, 31–39 (2015)Google Scholar
  10. 10.
    Li, L., Hagan, P.C., Saydam, S., et al.: Parametric study of rockbolt shear behaviour by double shear test. Rock Mech. Rock Eng. 49(12), 4787–4797 (2016)CrossRefGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Fei-fan Ren
    • 1
    • 2
    • 3
  • Zhuang Li
    • 2
  • Guan Wang
    • 4
  • Qi-hua Zhao
    • 3
  1. 1.Key Laboratory of Geotechnical and Underground Engineering, Ministry of EducationShanghaiChina
  2. 2.Department of Geotechnical EngineeringTongji UniversityShanghaiChina
  3. 3.State Key Laboratory of Geohazard Prevention and Geoenvironment ProtectionChengduChina
  4. 4.School of Environment and ArchitectureUniversity of Shanghai for Science and TechnologyShanghaiChina

Personalised recommendations