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中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 7    July 2020

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Evaluation of soil arching effect due to partially mobilized shear stress in piled and geosynthetic-reinforced embankment
LV Wei-hua(吕伟华)1, 2, WU Tao(武涛)1, GU Fan(顾凡)3, 4, GAO Lei(高磊)2

1. School of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China;
2. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,
Hohai University, Nanjing 210098, China;
3. National Engineering Laboratory of Highway Maintenance Technology, Changsha University of Science & Technology, Changsha 410114, China;
4. National Center for Asphalt Technology, Auburn University, Alabama 36830, USA

Abstract:In piled and geosynthetic-reinforced (PGR) embankment, the arching behavior determines the overburden load on piles and subsoils. Placement of geosynthetic is effective in reducing the relative displacement between pile and subsoil. When the mobilized shear stress is less than the shear strength, partially developed arching will occur. Consequently, existing analytical methods, adopting the ultimate shear strength failure criterion, need to be improved. This study developed a simplified 2D analytical method, which is based on the developing arching effect, to evaluate the load redistribution of the PGR embankment. Then, the influences of embankment height and internal friction angle, subsoil depth, ratio of pile cap width to pile clear spacing (RPC) and geosynthetic tensile stiffness on the critical height ratio, stress concentration ratio, soil arching ratio, geosynthetic tension and axial strain were investigated. This study suggests that a RPC of 1:1.0 and a one-way of single-layer geosynthetic tensile stiffness of 2000 kN/m should be considered as the sensitivity thresholds for the PGR embankment.

 

Key words: pile; geosynthetic; arching effect; mobilized shear stress; parametric analysis

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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