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采用欧拉-拉格朗日耦合(Coupled Eulerian-Lagrangian,CEL)有限元方法对于纺锤形桩靴基础的贯入过程进行数值模拟,揭示均质黏土、均质砂土及上砂下黏层状地基中桩靴基础的贯入机理。通过与已有离心模型试验结果的对比,在一定程度上验证建立的CEL有限元模型的合理性,进一步表明基于圆形浅基础承载力理论的桩靴贯入阻力计算公式在预测深层贯入时误差较大。随后比较系统地探讨上层砂土内摩擦角、下层黏土不排水抗剪强度等土性指标对基础贯入阻力曲线的影响,为层状地基中纺锤形桩靴基础承载力的计算提供一定参考。
Coupled Eulerian-Lagrangian (CEL) finite element method was used to simulate the penetration process of the spindled pile shoe foundation. The results showed that homogeneous clay, homogeneous sand and adherent sand The penetration mechanism of pile foundation in foundations. Through the comparison with the results of the existing centrifugal model test, the reasonableness of the established CEL finite element model is verified to a certain extent, and the formulas for calculating the penetration resistance of the pile shoe based on the circular shallow foundation bearing capacity theory are further indicated. When the deep penetration is predicted The error is larger. Then, the influences of the internal friction angle of the upper sand and the undrained shear strength of the lower clay on the penetration resistance of the foundation are systematically discussed, which will provide some references for the calculation of the foundation bearing capacity of the spiked pile shoe in the layered foundation.