CFG桩复合地基的特性研究

Study on Characteristic of CFG Pile Composite Foundation

阐述了CFG桩复合地基的变形模式和桩的侧阻分布特征,推导了下卧层为文克勒地基及桩—土的相互作用下CFG桩复合地基的沉降和桩土应力比的计算公式,并讨论了桩土应力比随桩长、桩间距和桩间土模量等因素变化的规律,计算结果表明,在竖向荷载作用下,桩土应力比随桩长的增大而增大,随桩间土的土体模量和桩间距的增大而减小.最后结合实例验证了本文所推导公式的合理性.

This article simply explains distribution character of pile friction and settlement model of CFG pile composite ground. The calculation method of settlement and the formulas of pile-soil stress ratio hold that the underlying layer of soil is winkle foundation and the interaction of pile-soil is deduced. And factors that influence the stress ratio are studied. The influence factors considered include the pile length, pile spacing, soil modulus, etc. The calculated results indicate that the stress ratio under vertical loads increases with the increase of the pile length, and decreases with the increase of the soil modulus and pile spacing. At last the rationality of the formulas deduced in this paper are validated combining with an example.