考虑荷载传递非线性特性的基桩竖向承载力计算  

Calculation of Vertical Bearing Capacity of Piles with Consideration of Nonlinear Characteristic of Load Transfer

作　　者：赵明华[1] 张洋[1] 张永杰[1] 

机构地区：[1]湖南大学岩土工程研究所,湖南长沙410082

出　　处：《公路交通科技》2011年第9期71-76,共6页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金资助项目(50878083)

摘　　要：在现有基桩竖向承载力计算方法基础上,考虑桩侧荷载传递的非线性特征,采用双曲线模型表示桩侧摩阻力。同时,为反映施工中桩端沉渣对承载力的影响,采用三折线模型表示桩端阻力,在此基础上采用幂级数求解方法建立考虑荷载传递非线性特性的基桩竖向承载力计算方法,反映土体分层影响与桩桩土相互作用。工程实例分析表明,对桩侧剪力-位移实测数据采用双曲线函数拟合,效果较好,计算P-s曲线与实测值吻合良好。该方法具有一定的合理性与可行性。Based on existing methods for evaluating the vertical bearing capacity of pile,a hyperbola model was used to describe the shaft resistance of pile with consideration of the nonlinear behavior of load transfer along the pile length.Meanwhile,for reflecting the influence of sediment at the pile tip on the bearing capacity during the pile construction,a three-broken-line model was used to represent the resistance at pile tip.In consideration of the nonlinear characteristic of load transfer,the differential equation for the vertical bearing capacity of piles was established and its relative solution was obtained by using power series method to describe the characteristic of the layered stratum and the pile-soil interaction.The result of an engineering case study indicate that the calculated p-s curve agrees well with the measured value when the hyperbola model was used to fit the test data of shaft shear force and the relative displacement,which shows the rationality and feasibility of the presented method.

关 键 词：桥梁工程 桩基础 荷载传递法 双曲线模型 三折线模型 幂级数 

分 类 号：TU473.1[建筑科学—结构工程]