《交通工程概论》短文模板.docVIP

浙江工业大学 课程论文 课程名称: 《交通工程概论》 学生姓名： 学 号： 专 业：土木工程交通土建方向2008(1)班 授课教师： 刘萌成 2011年 月 日 柔性基础下复合地基性状研究orking behaviors of composite ground under flexible foundation based on super-sub structure interaction(英文标题Times New Roman四号加粗) Abstract: Based on the deformation characteristics of composite ground under the flexible foundation, the composite ground is divided into four parts, including fill, cushion, composite foundation, and underlying layer. Through the analysis of a typical element, a simplified analytical model, which considers the above four parts as an interactive system, allows for the relative movement between piles and soils and assumes different settlements of foundation soil at the same level plane, is presented. And then according to the compatibility of stress and deformation on the interfaces between these four components, the formulas on settlement and stress ratio of pile-soil, which is used to characterize the behaviors of the composite ground, are derived. Finally, it is demonstrated that the results from this solution are in accordance with the measured ones of a project. So the proposed method can reflect the working behaviors of composite ground under the flexible foundation favorably(英文摘要Times New Roman小五). Key words: composite ground under flexible foundation; analytical solution; load transfer; relative movement(英文关键词Times New Roman小五)0 引言(一级标题：黑体四号) (正文 宋体五号)随着我国基础建设的不断发展，柔性基础下复合地基技术在交通、水利等部门中得到了广泛的应用，取得了良好的社会和经济效益。然而柔性基础下复合地基的理论研究大大落后于工程实践，在路堤、堤坝、堆场等工程的设计中仍沿用刚性基础下的设计理论。将刚性基础下复合地基的理论及相应的承载力和沉降公式用于路堤等柔性基础下复合地基，所得计算值与实测值相差太大，且偏于不安全[1]。因此，从工作性状、荷载传递特性、设计计算方法等各方面对其展开系统研究就显得非常的必要和紧迫。 在解析解方面Alamgir[2]提出了考虑桩、土沉降非同步性，忽略径向位移的位移模式，推导了柔性基础下端承桩复合地基桩身应力、桩侧摩阻力以及沉降计算的解析式；杨涛[3]通过引进“中性点”的概念假设中性点位置和桩侧摩阻力分布，推导了柔性基础下悬桩复合地基的沉降公式；刘杰[4]等在Alamgir假设的基础上，考虑径向变形，推导了柔性基础下复合地基加固区内桩及桩周土压缩量的计算公式；李海芳[5-6]提出了改进的位移分布模式，同时考虑了中性点和径向位移两个因素，利用假定