ABSTRACT

It is well recognised that footprints are formed during the spudcan insertion process, which can have a negative impact on adjacent pile foundations.This research presents a simplified three-dimensional finite element model to analyse the effect of footprints on the vertical bearing capacity of adjacent piles in clay. The soil parameters around the footprint were obtained via a comparative analysis of the results yielded by the hole-edge stress theory, a triaxial unloading shear test and an unloading state model test. Based on the simplified three-dimensional finite element model, the skin friction resistance changes of piles under different footprint depths, footprint diameters, and dimensionless distances L/D were calculated. The results showed that the reduction rate of the skin friction resistance of the pile decreases with increasing L/D and increases with increasing footprint diameter and footprint depth. .

摘要

公认的是，在桩钉插入过程中会形成脚印，这会对相邻桩基产生负面影响。本研究提出了一种简化的三维有限元模型，以分析脚印对相邻桩的竖向承载力的影响。在黏土中。通过对孔边缘应力理论，三轴卸荷剪切试验和卸荷状态模型试验得出的结果进行比较分析，获得了足迹周围的土壤参数。基于简化的三维有限元模型，桩在不同足迹深度，足迹直径和无量纲距离L / D下的皮肤摩擦阻力变化被计算了。结果表明，桩的皮肤摩擦阻力的减小率随着L / D的增加而减小，并且随着足迹直径和足迹深度的增加而增加。。