Abstract

Based on the nonlinear Winkler theory, a simplified method for evaluating the lateral bearing capacity of the caisson-pile foundation (CCPF) considering the effect of scour-hole dimensions was proposed. The reliability of this method was verified by the results from a model test. The influences of the scour-hole dimensions on the lateral bearing characteristics of the foundation were discussed. The results show that the influence degree of each individual factor on the ultimate lateral bearing capacity of the foundation was in the order of the scour depth, the scour width and the scour slope angle. In the meantime, as the slope angle decreases or the scour width increases, the decrease of the ultimate lateral bearing capacity becomes stable. Furthermore, the scour width effect on the ultimate lateral bearing capacity could be ignored when the width is greater than or equal to the caisson diameter, and the effect of scour slope angle could be ignored when the scour slope angle is less than 5°. The effect of scour width and scour slope angle on the bearing capacity of the foundation shows a similar trend when the scour depth varies differently. The results can provide a technical guide for the CCPF design.

摘要

基于非线性Winkler理论，提出了一种考虑冲孔尺寸影响的沉箱桩基础横向承载力评估的简化方法。模型试验结果验证了该方法的可靠性。讨论了冲孔尺寸对地基横向承载特性的影响。结果表明，各因素对地基极限横向承载力的影响程度依次为冲刷深度、冲刷宽度和冲刷坡角。同时，随着坡角减小或冲刷宽度增大，极限侧向承载力下降趋于稳定。此外，当宽度大于或等于沉箱直径时，冲刷宽度对极限侧向承载力的影响可以忽略，当冲刷倾角小于5°时，冲刷倾角的影响可以忽略。当冲刷深度不同时，冲刷宽度和冲刷坡角对地基承载力的影响呈现出相似的趋势。研究结果可为CCPF设计提供技术指导。