文章摘要
李兴波.多层地基中超长桩荷载传递机理的非线性计算方法[J].地质与勘探,2009,45(4):474-478
多层地基中超长桩荷载传递机理的非线性计算方法
Nonlinear Calculation Method of Load Transfer Mechanicsfor Super鄄long Pile in Multi鄄layered Soil
投稿时间：2008-12-07  修订日期：2009-05-22
DOI：
中文关键词: 超长桩 三阶段荷载传递模型 多层地基 侧阻软化 Rusch 模型
英文关键词: super鄄long pile,generalized hyperbolic load transfer model,layered soil,degradation of lateral friction,Rusch model
基金项目:
作者单位
李兴波 江苏昆山大宏工程顾问有限公司,昆山 
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中文摘要:
      [摘要]目前超长桩的理论远远落后于实践,分析超长桩的受力性能,提出合理的承载力计算模式 及相应的计算参数是目前急需解决的问题。论文基于超长桩试验资料,提出与超长桩桩侧土工作性状相 适应的弹性-软化-稳定三阶段荷载传递模型;桩端采用双曲线荷载传递模型模拟土的非线性变形特性;桩 身引入混凝土的Rusch 模型,以考虑高荷载水平作用下超长桩桩身混凝土的弹塑性性状。通过桩身任意 处微段竖向受力平衡,建立考虑桩身混凝土弹塑性关系的桩土体系荷载传递基本方程,在综合考虑桩侧土 软化稳定和桩端土非线形的基础上得到与超长桩工作性状相适应的层状地基中超长桩荷载传递分析方 法,并根据模型编制了相应的C 语言程序进行实例分析。计算得到的荷载-沉降曲线与实测的曲线吻合 较好。本文方法适用于计算多层地基中超长桩的沉降和极限承载力,也可用于分析层状地基中超长桩的 荷载传递规律。经过对工程实例的计算与实测对比分析,证明该法简单、可靠,且具有较好的适用性。
英文摘要:
      Abstract:Theory research on super鄄long pile working properties falls far behind its engineering practice, the most urgent problem we have to work out presently is to build up a reasonable model for super鄄long pile working properties, A load transfer model, based on the experimental data of super鄄long piles, is proposed in this paper while considering the elastic, degenerating and stabilizing processes which is in accord with working properties of the pile鄄 side soil; a hyperbola load transfer model is adopted to simulate the nonlinear deformation of pile鄄toe soil; a Rush concrete elastic鄄plastic model is intro鄄 duced, giving consideration to the super鄄long pile shaft deformation under huge loads. A basic pile鄄soil load transfer equation is built when taking the elas鄄 tic鄄plastic concrete model of pile shaft into account. Thus a load transfer method in calculating the layered soil is established and it could not only be used to calculate settlement and ultimate bearing capacity, but to show load transfer rules of the super鄄long piles in layered soil. The calculating load鄄settlement curve is generally in consistent with the experimental one. By comparison with many engineering instances, it is shown that the method proposed in this paper is simple and reliable in engineering practice.
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