Abstract

This paper proposes a novel method for calculating the ultimate lateral resistance exerted by sandy soil against laterally loaded piles. The ultimate lateral resistance distribution of the pile on the front side of the pile above the rotation point is determined by a modified strain wedge model with the three-dimensional cone shape, while the ultimate lateral resistance on the back side of the pile below the rotation point is calculated according to the theory of the passive earth pressure. Using the proposed distribution form of the ultimate lateral resistance along the pile length, an explicit expression to calculate the ultimate bearing capacity is obtained based on the limit equilibrium principle. The rationality of the proposed method is verified by several laboratory and field tests from published literature, and the comparative analysis show that the prediction results coincide with the experimental results. The variations in the normalized modified strain wedge shape depth, radius and ultimate bearing capacity of the pile with the change in the relative stiffness are deeply explored by using the proposed method, and some fitted expressions to quickly determine the modified strain wedge shape and estimate the ultimate bearing capacity of different piles are obtained.

摘要

本文提出了一种计算砂土对侧向荷载桩的极限侧向阻力的新方法。桩身在转点以上的前侧极限侧向阻力分布由三维锥形的修正应变楔模型确定，而在转点以下的桩后侧极限侧向阻力分布点按被动土压力理论计算。利用所提出的极限侧向阻力沿桩长分布形式，根据极限平衡原理，得到了计算极限承载力的显式表达式。所提出方法的合理性已通过已发表文献中的多个实验室和现场测试得到验证，对比分析表明，预测结果与实验结果吻合。利用所提方法深入探讨了桩的归一化修正应变楔形深度、半径和极限承载力随相对刚度变化的变化，并通过拟合表达式快速确定修正应变楔形并估计得到不同桩的极限承载力。