【作者】 张慧；

【导师】 王成华；

【作者基本信息】 天津大学 ， 结构工程， 2004， 硕士

【摘要】 目前由于桩基荷载传递机理还没有完全研究清楚，桩筏基础设计无论在理论上还是在实际上都存在某些不合理的地方。随着高层建筑的增多，桩体越建越长、基础承台越来越厚的现象日益增多。尽管超长桩具有高承载力、降低沉降的优点，但是不恰当地使用超长桩，不仅使基础造价大幅度上升，而且造成很多不必要的浪费。因此，进一步研究长桩的承载变形特征，对比超长桩与一般桩的异同就是本文的主要内容。本文通过桩土相互作用的三维有限元——无限元——接触面单元的非线性耦合数值模型，用matlab6.5编制的桩土相互作用程序来分析桩基在不同桩长、桩数、桩径、弹性模量、桩间距等情况下的承载变形的性质。程序设计为交互式界面，用户可以输出空间中任意平面上计算结果，观察空间不同位置处的受力和变形，并能方便地对输出图形进行各种文本编辑。最后为桩筏基础的优化设计提出了一些建议。更多还原

【Abstract】 During the design of pile-raft foundation, there still exist many problems because the research on theory of piles’ load-transfer mechanism is far behind the development of practice. With the development of super-long buildings, it is necessary to massly use super-long piles because of their high bearing capacity. However, the abuse of super-long pile results in a waste of money, energy and resource. So, the main purpose of this paper is to deal with the load-transfer mechanism of super-long pile and find out the different properties between super-long piles and piles.In this paper, based on a three dimensional nonlinear numeric model of the coupled finite element—infinite element—interface element, a program written by MATLAB is used to analyze the bearing and deformation mechanism of pile-raft foundation under different pile length, the number of piles and so on. All the results can be output by figure according to different uses and the users can edit all the figures freely.In the end, several pieces of advice about the design of pile-raft foundation are proposed.更多还原