At present, the research on the cavity formed by spudcan penetration is based on two-dimensional axisymmetric analysis of circular spudcans, and it is doubtful whether the results could be applicable to rectangular spudcans. In this paper, centrifuge experiments and finite element analysis are combined to study the penetration process of large scale rectangular spudcans in the clay with undrained shear strength varying with depth. Soil back-flow is found to occur preferentially from the middle of the edge and gradually extends to the entire side. The back-flow sequence of the soil near the long and short sides of the rectangular spudcan is different and is affected by the geometric characteristics, such as cone angle and aspect ratio. The influence of changes in soil strength and spudcan shape on the depth of the stable cavity is investigated through extensive parameter studies, and a new equation is proposed to provide the predictive value of stable cavity depth for engineering applications. The conclusion of the study can provide theoretical support for the application of rectangular spudcans.

目前，对桩墩穿透形成的空腔的研究是基于圆形桩墩的二维轴对称分析，其结果是否适用于矩形桩墩是值得怀疑的。本文结合离心实验和有限元分析，研究了不排水抗剪强度随深度变化的大型矩形桩墩在黏土中的渗透过程。发现土壤回流优先发生在边缘的中部，并逐渐延伸到整个侧面。矩形长钉罐长边和短边附近的土壤回流顺序是不同的，并且受锥角和长宽比等几何特征的影响。通过广泛的参数研究，研究了土强度和桩墩形状的变化对稳定腔深度的影响，并提出了一个新的方程式，为工程应用提供了稳定腔深度的预测值。研究结论为矩形桩架的应用提供了理论支持。