考虑桩侧初始剪应力的层状地基中单桩沉降计算简化解析  

Simplified analytical for settlement calculation of single pile in layered soil considering initial shear stress of pile side

作　　者：刘晓华 韦彬 张鹏鹏 赵炼恒[2] LIU Xiaohua;WEI Bin;ZHANG Pengpeng;ZHAO Lianheng(Shenzhen Transportation Design&Research Institute,Shenzhen 518003,China;School of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]深圳市综合交通设计研究院,广东深圳518003 [2]中南大学土木工程学院,湖南长沙410075

出　　处：《铁道科学与工程学报》2020年第4期875-881,共7页Journal of Railway Science and Engineering

基　　金：湖南省交通运输厅科技项目(201828)。

摘　　要：针对现有侧阻双曲线模型参数计算较困难的问题,提出一种考虑桩侧土初始剪应力以及侧阻软化特性的简化侧阻三折线模型;并结合桩端位移与桩端承载力的非线性发挥关系,采用双曲线模型模拟桩端荷载传递性状。进一步在上述桩侧和桩端荷载传递模型基础上,提出一种获取单桩荷载-沉降关系的简化递推分析方法。实例分析表明,本文所提简化模型与计算方法应用于单桩沉降计算具有较好的精度,且分析模型参数获取容易、计算便捷,研究成果可为设计施工提供有益参考。In view of the difficulty in calculating the parameters of the hyperbolic model of lateral resistance,a simplified trilinear model of lateral resistance is proposed,considering the existence of initial and ultimate shear stress and softening characteristics of lateral resistance of pile side soil.Based on the nonlinear relationship between the displacement of the pile end and the bearing capacity of the pile end,the hyperbolic model is used to simulate the load transfer shape of the pile end.Based on the above-mentioned load transfer models at the pile side and pile end,a simplified recursive analysis method is proposed to obtain the load-settlement relationship of a single pile.Engineering case analysis and numerical simulation analysis show that the model and calculation method proposed in this paper have good accuracy when applied to single pile settlement calculation,and the model parameters are easy to obtain and simple to calculate,which can provide reference for design and construction.

关 键 词：单桩沉降 初始剪应力 三折线模型 层状地基 数值模拟 

分 类 号：TU473[建筑科学—结构工程]