采动区CFG桩复合地基计算方法

针对CFG桩开采扰动复合地基计算理论落后于工程实践的现状,在现有的复合地基计算理论的基础上,根据采动地基的变形特征,提出采动区CFG桩复合地基承载力和沉降量计算方法。该方法以牛志荣等改进估算法和Ec法为基础,进行参数修正和公式改进。工程实例表明,该方法计算准确度较高,明显优于现有方法。该研究为CFG桩加固处理扰动地基提供了理论参考。

Calculation method for CFG pile composite foundation in mining subsidence area

In response to the currently used calculation theory out of step with the engineering practices in the field of CFG pile mining disturbance composite foundation,this paper proposes the calculation method for the bearing capacity and settlement of the CFG pile composite foundation in the mining subsidence area,depending on the comparative analysis of the existing calculation theories for composite foundation and according to the deformation features of the mined foundation.This method offers modified parameters and improved formulas,based on the estimation method improved by Niu Zhirong et al and Ec method.The engineering practice shows that the method features a higher accuracy and significant advantage over the existing methods.The present study provides definite theoretical references for dealing with the disturbed foundation with CFG pile reinforcement.