桩基负摩擦力的下拉荷载与时间关系研究  

Studies of relation between drag load and time of negative skin friction of pile foundation

作　　者：肖俊华[1] 袁聚云[2] 赵锡宏[2] 

机构地区：[1]山东建筑大学,济南250101 [2]同济大学地下建筑与工程系,上海200092

出　　处：《岩土力学》2009年第9期2779-2782,共4页Rock and Soil Mechanics

摘　　要：桩基负摩擦力的发展分为两个阶段,第1阶段受桩-土相对位移控制,第2阶段受桩周土体固结而引起的强度增长的控制。根据日本、加拿大和泰国的现场实测结果的再分析,下拉荷载与时间的关系可采用双曲线进行拟合,初步探讨其中参数的物理意义。通过对实例的计算表明,计算与实测结果具有很好的一致性,证明所提出方法的可行性,为进一步研究桩基负摩擦力的应用提供有利条件。The development process of negative skin friction is divided into two stages. At the first stage, it is mainly controlled by the relative displacement between soil and pile, and at the second stage, it is mainly controlled by the increase of soil strength caused by consolidation. Based on the re-analysis of data from history cases in Japan, Canada and Thailand, the relation between drag load and time can be fitted with hyperbolic curve, in which the physical meanings of parameters are preliminarily discussed. The results of history cases indicate that the calculated results fit well with in-situ test data, which verifies the feasibility of the method presented.

关 键 词：负摩擦力 下拉荷载 再分析 双曲线 

分 类 号：TU473[建筑科学—结构工程]