(1 河南大学材料与结构研究所，开封 475001; 2 河南大学土木建筑学院，开封 475001)

［摘要］为探讨钢筋混凝土预制桩和水泥土搅拌桩组合桩(简称组合桩)在水平荷载作用下的受荷特性和承载力，基于组合桩的水平载荷试验结果和土体离散层模型，分析了这种组合桩受水平力作用时的变形、内力和桩周土压力分布。结果表明，钢筋混凝土预制桩芯桩的插入改变了水泥土搅拌桩的传力特点，提高了桩的侧摩阻力和侧向承载力；组合桩具有较好的抗侧向变形的能力，桩体侧向变形主要集中于桩的上部；桩周土体的侧压力上部较大，上部和下部受力方向相反；组合桩桩体的弯矩和剪力主要分布在桩体的上半部；芯桩对桩体的刚度、侧向变形大小起决定作用，而对桩体的弯矩和剪力的分布影响较小。

［关键词］钢筋混凝土预制桩；水泥土搅拌桩；组合桩；水平受荷；芯桩

中图分类号：TU473.1文献标识码：A文章编号：1002-848X(2011)03-0095-03

Characteristic of composite piles of reinforced concrete precast pile and cement mixed pile under lateral load

Peng Yanwei¹, Yue Jianwei^{1, 2}, Wei Kun²

(1 Research Institute of Material and Structural Engineering, Henan University, Kaifeng 475001, China；

2 School of Civil and Architectural Engineering, Henan University, Kaifeng 475001, China)

Abstract:To study the characteristic and capacity of a newstyle composite pile under lateral loads based on test results and discrete layer model of soil, the pile deformation, moment, shear and soil pressure around the pile were analyzed under lateral loads. The results indicate that inserting a core pile can modify stiffness and transfer way of the cement mixed pile and improve its side frictional resistance and lateral capacity. The composite pile has bigger lateral stiffness and lateral deformation is mainly distributed in the upper part of the pile under lateral load. Soil pressure around the composite pile in the upper part is bigger than that of in the lower part and has reverse direction. Moment and shear of the composite pile are also mainly distributed in the upper part. Contrast results show that the core pile plays an important role in stiffness and lateral deformation of the composite pile, and has less influence on moment and shear of the composite pile.

Keywords:cement mixed pile; reinforce concrete precastpile; composite pile; lateral load; core pile

作者简介：彭燕伟，硕士研究生，Email：pyw0316@163.com。

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