端承型桩承载力离心模型试验中的粒径效应研究  

Particle Size Effects on the Centrifuge Bearing Capacity Tests of the End Bearing Pile

作　　者：柳飞[1,2] 杨俊杰[2,3] 侯瑜京[4] 吴炼石[5] 

机构地区：[1]北京市市政工程研究院,北京100037 [2]中国海洋大学环境科学与工程学院,山东青岛266100 [3]中国海洋大学海洋环境与生态教育部重点实验室,山东青岛266100 [4]中国水利水电科学研究院,北京100044 [5]山东省水利勘测设计院,山东济南250013

出　　处：《中国海洋大学学报（自然科学版）》2011年第9期59-66,共8页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(50779062)资助

摘　　要：利用modeling of models的方法研究端承型桩承载力离心模型试验中的粒径效应。在模拟同一原型时,不同桩径的模型桩,桩身压缩性及桩长均不同,导致侧摩阻力发挥机理及程度不同,本文分别探讨了桩端阻力,侧摩阻力及承载力(桩顶荷载)的粒径效应对承载机理和承载特性的影响。结果表明,桩端阻力的粒径效应作用规律与浅基础一致,可以借用浅基础的粒径效应定量评价方法评价端承桩承载力离心模型试验中的粒径效应。侧摩阻力的粒径效应比桩端阻力的粒径效应显著。由于侧摩阻力的影响,相同条件下承载力的粒径效应比桩端阻力有所增强。对于极限桩端阻力和极限承载力,粒径效应均随长径比的增加而减弱。The particle size effects on the centrifuge bearing capacity test of the end bearing pile were studied by modeling of models. For the same prototype, because the different model piles had different length and compressibility, the mobilization of the shaft resistance was different. In this paper, the influence of the particle size effec on the end resistance, the shaft resistance and the total pile resistance were discussed respectively. The test results showed that the rule of particle size effects on the end resistance was the same as the shallow foundation, and the index evaluating the particle size effects on the shallow foundation could be used to assess the influence on the end resistance. The particle size effect on the shaft resistance was more obvious than the end resistance. And because of the shaft resistance, the particle size effect on the total pile resistance was also more marked than the end resistance in the same condition. For both the end resistance and the total pile resistance, the particle size effect decreased as the slender ratio increased.

关 键 词：离心模型试验 承载力 桩基 粒径效应 长径比 

分 类 号：TU411.93[建筑科学—岩土工程]