大直径灌注筒桩轴向荷载传递性状分析  

Analysis of Axial Load-transfer of Large-diameter Tubular Pile Using Cast-in-situ Concrete

作　　者：王哲[1] 龚晓南[1] 陈建强 

机构地区：[1]浙江大学岩土工程研究所,浙江杭州310027 [2]四川省广安市公路管理处,四川广安638000

出　　处：《苏州科技学院学报（工程技术版）》2005年第1期32-38,共7页Journal of Suzhou University of Science and Technology （Engineering and Technology）

基　　金：浙江省水利厅科研项目(I40301)

摘　　要：大直径现浇混凝土薄壁筒桩为高速公路软弱地基处理中的一种新型高效优质桩。筒桩不同于一般的灌注或沉管实心桩的荷载传递机理,筒桩内土芯作用机理复杂,目前筒桩的荷载传递机理没有得到完整的阐述,从而制约了筒桩承载理论的发展与工程应用。考虑大直径灌注筒桩土芯分担荷载以及筒桩与土芯内摩阻力发挥情况,采用线弹性-塑性荷载传递函数,推导出一种沉管灌注筒桩的轴向荷载-沉降曲线的解析算式,并计算得到任意截面桩身轴力及内外侧摩阻力表达方程式。计算结果表明,土芯分担顶部荷载并提供内侧摩阻力,对增大承载力和减小沉降量都有贡献。Thin-wall cast-in-situ tubular pile is a new type of high quality pile which has a good application in soft ground treatment. Load transfer mechanism of tubular pile is not expatiated integrally because of the complexity of soil core's mechanism, which restricts the development of the pile's bearing theory and its practice application. With linear elastic-plastic load transfer function, a set of analytical equations for the axial load-settlement curve of thin-wall cast-in-situ tubular pile are deduced. Correlative parameters of the pile-soil system could be got from fitting measured P-S curve, the distribution equations of axial force and friction along pile could be calculated. A case study is presented to validate the method.

关 键 词：薄壁灌注筒桩 荷载-沉降曲线 荷载传递 解析解 

分 类 号：TU473.1[建筑科学—结构工程]