复合载体夯扩桩承载力性状有限元分析

本文对复合载体夯扩桩进行了有限元分析，在分析中通过现场取样和模型试验确定夯扩挤密区范围，通过分段线性插值确定夯扩影响区土单元的材料参数，从而能够较为准确地分析这种桩承载力的特殊性状。本文根据计算结果讨论了桩身的荷载传递规律、承载力的计算及最优夯扩体直径的确定，同时也比较了这种桩与扩底灌注桩在承载力特性方面的区别，从而揭示了复合载体夯扩桩承载力性状的基本规律，说明了复合载体夯扩桩是一种承载力性能优越的桩型。

FINITE ELEMENT ANALYSIS OF BEARING CAPACITY PROPERTIES FOR RAMMED ENLARGED COMPOSITE BEARER PILES

The bearing capacity of ram-compaction pile with composite bearing base is studied using FEM. The area of densified soil is determined by field sampling and model experiment. The model parameters of densified soil are determined by piecewise linear interpolation so that the special characteristics of bearing capacity of the pile can be accurately analyzed. The load-transferring mechanism, the optimum diameter of ram-compaction body and the difference of the vertical bearing capacity between rammed enlarged composite bearer piles and expanded head cast-in-place piles are discussed. The fundamental mechanism of bearing capacity of ram-compaction pile with composite base is enunciated. It is shown that the piles of this kind are superior in bearing capacity.