不同桩体刚度对复合地基的影响

Influence of Column Rigidity on Composite Foundation

结合两例不同桩体刚度的工程实例石灰搅拌桩和CFG桩复合地基,进行了室内试验、现场载荷试验及非线性有限元分析,探讨了柔性桩复合地基和半刚性桩复合地基受力、变形性能的不同所在,指出桩体刚度的变化是影响复合地基承载特性的重要因素,进而提出了区分这两类复合地基的大致界限范围.同时,通过现场载荷试验,验证了数值分析方法的可靠性和地基土本构模型选取的合理性.

Based on laboratory tests and loading tests in site together with nonlinear finite element analysis of two pratical projects with different column rigidities,i.e.composite foundations of mixed lime-soil column and CFG pile, the bearing behaviours and deformations of soft pile composite foundation and semi-stiff pile composite foundation are discussed. The results illustrate that column rigidity is an important factor affecting the load transmitting in composite foundation. The ranges of distinguishing these two types of foundations are suggested. Loading tests prove the reliability of the numerical analysis method and the rationality of the soil constitutive models.