CFG桩复合地基承载特性的试验及数值分析

摘要

CFG pile is widely used in practical engineering due to the high pile modulus and good foundation treatment effect. In this paper,plate load tests were conducted to research the bearing capacity characteristics of single pile,surrounding soil and composite foundation systematically. The bearing mechanism of composite foundation reinforced by CFG pile was also discussed. Based on plate load tests,the axisymmetric FEM model was built. The load transfer law and the influence of pile length and replacement ratio on composite foundation bearing capacity were also researched.%CFG桩由于桩身模量较高，地基处理效果较好，已经被广泛应用于工程实践中。利用载荷板试验，对CFG桩的单桩、桩间土以及复合地基的承载力特性进行了全面讨论，并阐述了CFG桩复合地基的承载力机理。基于复合地基载荷板试验，建立了轴对称有限元分析模型，讨论了CFG桩的荷载传递规律以及置换率和桩长对于CFG桩复合地基承载力的影响。