Geomechanics and Engineering

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Development of design chart for estimating penetration depth of dynamically installed Hall anchors in soft clays

  • Haijun Zhao (China Construction Eight Engineering Division Rail Transit Construction Co., L.T.D.) ;
  • Zhaohan Zhu (School of Electrical Engineering, Southwest Jiaotong University) ;
  • Jiawei Che (China Construction Eight Engineering Division Rail Transit Construction Co., L.T.D.) ;
  • Wanchun Chen (China Construction Eight Engineering Division Rail Transit Construction Co., L.T.D.) ;
  • Qian Yin (Nanjing Metro) ;
  • Dongli Guo (China Construction Eight Engineering Division Rail Transit Construction Co., L.T.D.) ;
  • Haiyang Hu (China Construction Eight Engineering Division Rail Transit Construction Co., L.T.D.) ;
  • Shuang Dong (China Construction Eight Engineering Division Rail Transit Construction Co., L.T.D.)
  • Received : 2023.02.03
  • Accepted : 2023.06.23
  • Published : 2023.07.25
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Abstract

In this study, a series of three-dimensional numerical analyses were carried out to investigate the penetration performance of a dynamically installed Hall anchor. The advanced coupled Eulerian-Lagrangian (CEL) technique was adopted to accurately simulate the large soil deformation during the vertical penetration of a Hall anchor. In total, 52 numerical analyses were conducted to investigate the relationship between anchor penetration depth and the initial kinematic energy. Moreover, a sensitivity analysis was performed to investigate the effects of soil shear strength and soil type on the penetration mechanism of a drop anchor under self-weight. There is a monotonic increase in the penetration depth with an increasing anchor weight when the topsoil of the riverbed is not subjected to erosion. On the other hand, all the computed depths significantly increase when soil erosion is taken into consideration. This is mainly due to an enhanced initial kinematic energy from an increased dropping depth. Both depths increase exponentially with the initial kinematic energy. An enhanced shear strength can potentially increase the side resistance and end-bearing pressure around a drop anchor, thus significantly reducing the downward penetration of a hall anchor. Design charts are developed to directly estimate penetration depth and associated plastic zone due to dynamically installed anchor at arbitrary soil shear strength and anchor kinematic energy.

Keywords

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