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Geomechanics and Engineering
  Volume 32, Number 6, March25 2023 , pages 639-652
DOI: https://doi.org/10.12989/gae.2023.32.6.639
 


3D stability of pile stabilized stepped slopes considering seismic and surcharge loads
Long Wang, Meijuan Xu, Wei Hu, Zehang Qian and Qiujing Pan

 
Abstract
    Stepped earth slopes incorporated with anti-slide piles are widely utilized in landslide disaster preventions. Explicit consideration of the three-dimensional (3D) effect in the slope design warrants producing more realistic solutions. A 3D limit analysis of the stability of pile stabilized stepped slopes is performed in light of the kinematic limit analysis theorem. The influences of seismic excitation and surcharge load are both considered from a kinematic perspective. The upper bound solution to the factor of safety is optimized and compared with published solutions, demonstrating the capability and applicability of the proposed method. Comparative studies are performed with respect to the roles of 3D effect, pile location, pile spacing, seismic and surcharge loads in the safety assessments of stepped slopes. The results demonstrate that the stability of pile reinforced stepped slopes differ with that of single stage slopes dramatically. The optimum pile location lies in the upper portion of the slope around Lx/L = 0.9, but may also lies in the shoulder of the bench. The pile reinforcement reaches 10% universally for a looser pile spacing Dc/dp = 5.0, and approaches 70% when the pile spacing reaches Dc/dp = 2.0.
 
Key Words
    limit analysis; pile; pseudo-static method; safety factor; slope stability
 
Address
Long Wang: School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China;
Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China
State Key Laboratory of Geohazard Prevention and Geoenvironmental Protection, Chengdu University of Technology,
Chengdu 610059, China
 

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