Calculation of Horizontal Bearing Capacity of Anti-Slide Piles Based on Soil Arching Effect and Improved Strain Wedge Model in Loess Sites

doi:10.16183/j.cnki.jsjtu.2023.650

Abstract

Abstract:

Landslide prevention and control is one of the prominent topics in the field of geological hazards. The passive soil arching effect, adjacent to the piles, is a key factor influencing the horizontal load-bearing capacity of anti-slide piles. However, research on the influence of this passive soil arching effect on the internal force and deformation of anti-slide piles shaft is still relatively limited. To address this, based on the existing strain wedge methodology, this paper analyzes the passive soil arching effect and its mechanical characteristics along the embedded segment of anti-slide piles. An improved strain wedge calculation model for the row piles is proposed, effectively incorporating the passive soil arching effect in front of the anti-slide piles. Verification results demonstrate the accuracy of this proposed model. The main contributions of this paper are as follows. By introducing the concept and the stress characteristics of passive soil arching ahead of the anti-slide piles, new criterion for the soil failure in front of anti-slide piles is proposed as the failure of the passive soil arching. Additionally, the calculation width of the strain front edge of the wedge for pile groups to one time of the pile spacing, allows for more reasonable analysis of the passive soil arching stress in row piles. Considering the influence of static lateral soil pressure on the soil mass and pile-soil interaction in front of the anti-slide piles, the stress state characterization within the passive soil arch formation achieves enhanced analytical rigor. This systematic methodology consequently enables more precise determination of both internal force distribution patterns and deformation responses. The improved strain wedge model for row piles proposed in this paper can accurately reflect the variations law of soil resistance in front of anti-slide piles during the interaction between adjacent piles, and the developed iterative computation program for optimizing internal forces and deformations of row pile shafts offers a novel solution for engineering applications.

Key words: anti-slide piles, passive soil arching, improved strain wedge, horizontal load-bearing capacity, loess

CLC Number:

TU473

LUO Lijuan, REN Xiang, LI Sheng, TANG Yong, HE Pengyuan. Calculation of Horizontal Bearing Capacity of Anti-Slide Piles Based on Soil Arching Effect and Improved Strain Wedge Model in Loess Sites[J]. Journal of Shanghai Jiao Tong University, 2026, 60(1): 163-174.

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方程	说明
y₁-2y₀+y_-1=0	桩底弯矩M=0
y₂-2y₁+2y_-1-y_-2=0	桩底剪力Q=0
y₂-4y₁+6y₀-4y_-1+y_-2=ζp₀	桩底土抗力p₀乘以系数ζ
y₃-4y₂+6y₁-4y₀+y_-1=ζp₁	点1处土抗力p₁乘以系数ζ
y_i₊₂-4y_i+1+6y_i-4y_i_-1+y_i_-2=ζp_i	嵌固段点i土抗力p_i乘以系数ζ
y_n₁+5-4y_n₁+4+6y_n₁+3-4y_n₁+2+y_n₁+1=ζp_n₁+3	地面点n₁+3土抗力p_n₁+3乘以系数ζ
y_n₁+5-2y_n₁+4+2y_n₁+2-y_n₁+1=ψQ_n₁+3	地面点n₁+3剪力Q_n₁+3乘以系数ψ
y_i₊₂-2y_i₊₁+2y_i_-1-y_i_-2=ψQ_i	悬臂段点i剪力Q_i乘以系数ψ
y_n₊₂-2y_n₊₁+2y_n_-1-y_n_-2=ψQ_n	桩顶剪力Q_n乘以系数ψ
y_n₊₁-2y_n+y_n_-1=0	桩顶弯矩M=0