楔形刚性桩与桩周土的非线性相互作用  

Nonlinear Interaction between the Rigid Taper Pile and Pile-surrounding Soil

作　　者：刘杰[1] 何杰[1] 闵长青[1] 

机构地区：[1]湖南工业大学岩土工程研究所,湖南株洲412008

出　　处：《铁道学报》2010年第2期137-140,共4页Journal of the China Railway Society

基　　金：国家自然科学基金资助项目(50878084)

摘　　要：为探讨楔形桩的承载特性及沉降性状,本文以桩侧摩阻力分布满足双曲线模型和桩端阻力分布满足线性模型为基本假定,建立楔形刚性桩与桩周土非线性相互作用的力学模型。同时,利用荷载传递法及非线性分析的增量法,获得荷载-沉降关系等系列解析算式。算例结果表明,楔形桩侧壁倾角增大,桩侧摩阻力提高,桩与土之间的径向相互作用增强,单桩承载力提高。为了验证力学模型的可行性,对两根不同侧壁倾角的楔形桩进行模型实验,结果表明,本文建立的力学模型所得结果与实测结果吻合较好。In order to study the bearing characteristics and settlement behavior of the taper pile,the mechanical model of nonlinear interaction between the rigid taper pile and pile-surrounding soil is established on the basis of the hyperbola model of pile-side friction and the linear load model of pile end force distribution.Meantime,by using the load transfer method and the nonlinear-analysis increment method,a series of analytical formulae are deduced to define the load-settlement relation and so on.The results of the calculating examples indicate that when the side obliquity of the rigid taper pile is augmented,the pile-side friction resistance is raised,the radial interaction between the pile and the soil is strengthened and the single-pile bearing capacity is increased.In order to validate the feasibility of the mechanical model,a static load model test of two rigid taper piles with different side obliquities is done in the laboratory.The calculated and measured values prove to reach good agreement.

关 键 词：楔形桩 双曲线模型 荷载传递法 荷载-沉降关系 

分 类 号：TU473.1[建筑科学—结构工程] U443.15[建筑科学—土工工程]