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利用FLAC3D建立了桩承式路堤上部填土的数值计算模型,分析了路堤应力以及塑性区分布,提出了路堤拱效应分布图。在此基础上对Hewlett穹顶拱模型进行了改进,提出了刚性核弧拱力学计算模型,推导了应力折减比公式。将计算方法应用于广梧高速公路PHC管桩现场试验段,采用现有的5种方法与改进方法进行对比,结果表明改进的刚性核模型与实测吻合最好。
Using FLAC3D, the numerical calculation model of the upper filling of piled embankment is established. The stress and plastic zone distribution of the embankment are analyzed, and the distribution of embankment arch effect is proposed. Based on this, the Hewlett dome arch model is improved, and the calculation model of rigid nuclear arch mechanics is proposed. The formula of stress reduction ratio is deduced. The calculation method is applied to the field test section of PHC pipe pile in Guang-Wu Expressway, and the existing five methods are compared with the improved method. The results show that the improved rigid nuclear model is in good agreement with the actual measurement.