多层地基中超长桩荷载传递机理的非线性计算方法

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栽传递分析方法,并根据模型编制了相应的C语言程序进行实例分析.计算得到的荷栽-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.

Nonlinear Calculation Method of Load Transfer Mechanics for Super-long Pile in Multi-layered Soil

Theory research on super-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-long pile working properties,A load transfer model,based on the experimental data of super-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-side soil;a hyperbola load transfer model is adopted to simulate t...