Rock and Soil Mechanics ›› 2022, Vol. 43 ›› Issue (5): 1207-1214.doi: 10.16285/j.rsm.2021.6618

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Experimental study of pullout behavior of horizontal anchor plates in geogrid reinforced sand

ZHU Hong-hu1, 2, GAO Yu-xin1, LI Yuan-hai2, NI Yu-fei1   

  1. 1. School of Earth Science and Engineering, Nanjing University, Nanjing, Jiangsu 210023, China 2. State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
  • Online:2022-05-13 Published:2022-07-04
  • About author:ZHU Hong-hu, male, born in 1979, PhD, Professor, mainly engaged in scientific research on monitoring and evaluation of geology and geotechnical engineering.
  • Supported by:
    the National Key Research and Development Program Project (2018YFC1505104), the National Natural Science Foundation of China (42077235) and the Open Fund of the State Key Laboratory for Geomechanics and Deep Underground Engineering (SKLGDUEK1902).

Abstract: Geogrid reinforcements can effectively improve the pullout capacity of anchor plates, but the failure mechanism and influencing factors during the uplift process need to be further investigated. In this paper, a series of uplift tests was carried out on horizontal anchor plates in sand to investigate their pullout characteristics, and the influence of various factors was analyzed, including sand density, anchor embedment depth, and number of geogrids and their locations. The particle image velocimetry (PIV) technology was used to explore the deformation and failure mechanism of the sand around anchor plates. The results show that for the pullout capacity of an anchor plate is significantly enhanced by one layer of contact-type geogrid, and the reinforcing effect is better than that with non-contact geogrid. This phenomenon is associated with mobilized friction of the geogrid and the increased weight of sand within the failure surface. When two layers of geogrids are installed, the lower geogrid plays a dominant role in restricting the lateral soil deformation and homogenizing the stress distribution, and the contribution of the upper geogrid is relatively low. Whether geogrids are applied or not will alter the deformation mechanism at the anchor-sand interface. With geogrid reinforcement, the failure surface converges inward, and the shear strain distribution is more uniform.

Key words: geogrid reinforcement, uplift of anchor plate, pullout capacity, particle image velocimetry (PIV), interface behavior