CFG桩加固软基复合地基桩间距设计计算方法

Pile Distance's Design & Calculation in CFG Pile Composite Ground Treated Soft Clay Foundation

从复合地基承载力、工后沉降量以及成桩过程中的打桩效应3个方面综合分析,提出分别按复合地基承载力、工后沉降量以及成桩过程中的打桩效应进行复合地基桩间距设计计算的方法,分别运用文中提出的5种方法对某工程实例进行了设计计算。结果表明,按规范与经验设计计算的结果与考虑打桩效应的设计值比较吻合;按承载力控制和按工后沉降控制的设计值一致,这两种方法没有考虑施工过程及打桩效应,设计值偏低,实际运用时应对各种结果进行综合考虑。本文的成果改善了复合地基桩间距的设计理论和计算方法,可参考用于设计。

Pile distance's design and calcuation are important in CFG pile composite ground treaded soft clay foundation.The bearing capacity and post-construction settlement and effect of driving pile are very important factors and should be take into account during the course of designing and calculating pile distance.Three kinds of calculation methods and formula on pile distance are put forward according to bearing capacity and post-construction settlement and effect of driving pile in CFG pile composite ground,and an example is given.The results of the example show that five kinds of design methods all should be taken into account in practice.The results of the paper consummate the design and calculation methods and theories of composite ground and can be applied and used for design.