Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (3): 727-735.doi: 10.16285/j.rsm.2019.5577

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Upper bound analysis of the lateral bearing capacity of rigid piles in sloping ground

ZHAO Ming-hua, PENG Wen-zhe, YANG Chao-wei, XIAO Yao, LIU Ya-nan   

  1. Institute of Geotechnical Engineering, Hunan University, Changsha, Hunan 410082, China
  • Online:2020-03-27 Published:2020-09-27
  • About author:ZHAO Ming-hua, male, born in 1956, PhD, Professor, Doctoral supervisor, research interests: pile foundation and soft soil foundation treatment.
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(51478178).

Abstract: This paper investigated the lateral ultimate bearing capacity of rigid pile in sloping ground. Firstly, the effective embedment depth of equivalent rigid piles of flexible piles and the mechanical characteristic of laterally loaded rigid piles are introduced. Secondly, two failure modes for the soil in front of laterally loaded piles are proposed under different directional loads at the top of piles (pointing toward and away from slope). Then, the ultimate bearing capacity of the rigid pile under different directional loads is derived on the basis of the upper limit theorem of limit-equilibrium analysis, and the rationality of the proposed method is verified by field tests. Finally, effects of the slope, internal friction angle, cohesion and load direction on the ultimate bearing capacity are investigated and some general conclusions are drawn. At the meantime, a fitting formula for the lateral ultimate bearing capacity of the rigid pile in sloping ground that considering the slope angle is proposed on the basis of the analysis results. References and guidance for design of piles in sloping ground are provided, which are valuable in both theoretical and engineering applications.

Key words: bridge engineering, ultimate bearing capacity, limit-equilibrium analysis, laterally loaded rigid pile, sloping ground, failure mode