疏桩作用路基的荷载效应剪切位移解析解  

Analytical Solution for Load Effect of Sparse Piles on Embankment by Shear Displacement Method

作　　者：石名磊[1] 张浩[1] 曾志军[2] 袁龙[1] 

机构地区：[1]东南大学交通学院,江苏南京210096 [2]海军工程设计研究院,北京100070

出　　处：《中国公路学报》2014年第6期10-16,共7页China Journal of Highway and Transport

基　　金：住房和城乡建设部科学技术计划项目(2008-K2-12)

摘　　要：为揭示疏桩支撑路基结构的荷载传递机理,针对疏桩作用路基的荷载效应特点,基于剪切位移分析法原理和大桩群单元简化模型,提出了疏桩支撑路基内部的荷载传递剪切位移分析模型;通过假定单元模型内、外土柱界面剪切力与对应相对位移的理想弹塑性关系,结合广义剪切位移概念,推导了路基单元模型的荷载传递控制方程,进而考虑疏桩路基中路基-垫层双层结构特点,建立了双层体系下路基荷载传递的剪切位移解析解。研究结果表明:所提出的模型在疏桩路基中具有较好的适用性,可拓展应用于分离式桩筏基础的桩土荷载效应分析。In order to reveal the load transfer mechanism of embankment structure supported by sparse piles, according to the load characteristics of the action of sparse piles to embankment, based on the shear displacement analysis theory and the unit cell of large pile group, a shear displacement analysis model was presented to analyze the embankment load transfer. The relationship of shear stress and relative displacement between the fill column on pile and the surrounding fill was idealized to be perfectly elasto-plastic, then based on this assumption, the governing differential equations of load transfer of embankment unit cell were derived by introducing the generalized shear displacement concept. With the characteristics of embankmentcushion structure considered, shear displacement analytical solution for the load transfer of double-layer system was obtained. The results show that the proposed method has good applicability in embankment supported by sparse piles and its extension can be used in pile-soil load effect analysis of separate piled raft foundation.

关 键 词：道路工程 路基 剪切位移分析法 桩土应力比 疏桩 土拱效应 

分 类 号：U416.01[交通运输工程—道路与铁道工程]