路堤下CFG桩复合地基桩土应力比计算修正

Calculation and correction of pile-soil stress ratio of CFG pile composite foundation under embankment

为了更准确地反映刚性桩复合地基的工作状态,提高实际工程质量,以路堤下CFG复合地基为研究对象,在基本假定的前提下,分别建立类端承桩复合地基和类摩擦桩复合地基的力学模型。分析导出CFG桩复合地基工作的受力平衡条件及变形协调条件,对路堤下CFG桩复合地基桩土应力比计算公式进行修正,并对桩土应力比的影响因素进行分析。以相关文献中基础工程的现场桩土应力实测资料为基础数据,运用修正后的计算方法进行验证。结果表明,类端承型CFG桩复合地基桩土应力比的计算结果与实测结果较为吻合,修正后的计算方法能满足实际工程计算的需要。研究成果可提高实际工作中承载力和沉降的计算准确度,为进一步完善CFG桩地基工程设计及计算方法提供参考。

In order to reflect the working state of rigid pile composite foundation more accurately and improve the actual engineering quality,taking CFG composite foundation under embankment as the research object,the mechanical models of end-bearing pile composite foundations and friction pile composite foundations were established respectively under the premise of basic assumptions.The stress balance conditions and deformation coordination conditions of CFG pile composite foundation were analyzed and derived.The calculation formula of pile-soil stress ratio of CFG pile composite foundation under embankment was modified,and the influencing factors of pile-soil stress ratio were analyzed.Based on the measured data of pile-soil stress of foundation engineering in related literature,the modified calculation method was used to verify.The results show that the calculation results of pile-soil stress ratio of end-bearing CFG pile composite foundation are consistent with the measured results,and the modified calculation method can meet the needs of practical engineering calculation.The research results can improve the calculation accuracy of bearing capacity and settlement in practical work,and provide reference for further improving the design and calculation method of CFG pile foundation.