刚性桩复合地基工作性能研究-结构工程专业论文.docxVIP

中文摘要 摘要 近几年刚性桩复合地基在国内得到大量应用，取得了显著的经 济效益与社会效益。但是由于不同厚度、不同密实度的褥士在层对 tit 土荷载分配有较大影响，使得刚性桩复合地基的工作机理变得非常 复杂。本文以现场试验为基础并利用数值分析方法对刚性杭复合地 基的荷载传递机理和破坏过程进行了研究，主要完成了以下工作: 就目前对刚性桩复合地基的研究现状作了简要介绍，分析阐述 了急需解决的问题。本文是以现场试验为基础，研究刚性桩复合地 基的工作性能。完成现场原型试验共 ìt 8 绍，对复合地基的桥 f 分 担荷载情况和垫层的压缩及变形特征进行了较全面的量测，试验揭 示了复合地基的荷载传递的过程以及垫层的加入对承载力和变形 特性的影响。最后利用二维有限元方法，探讨了辛辛层厚度和挚层愤 量对桩身轴力、桩身负摩阻力以及复合地基荷载一沉降特性的影响 规律。 关键词:刚性桩复合地基工作性能褥垫层 承载力 英文摘要 Abstract 民igid pile composite-foundation has been in great use these years ， which has gained social and economic benefit. But the different thickness and density of cushion have a large effect on the load allocation between pile and soi l. Therefore the behaviors of rigid pile composite-foundation are very co mplicated. We made a study on the load transfer mechanism and failure progress of rigid pilc composition foundation based on on-site test and numeric analysis method ，and such work as follows has been done A bri 巳f introduction about current rigid pile composite-foundation research is made and the problem urgent n eed to be solved currently i s analyzed. Based on on-site te st ，we made a study on the work behaviors of rigid pile composite-foundation. Total 8 groups tests have been made ，and a comprehensive measur 巳 had been taken on the load allocation between pile and soil and the compression and deformation character of cushion . The tests disclose the progress of the composition foundation load transfer and the cushion effect on bearing capacity and deformation. At last ，a discussion is made on the effect of cushion thickness and module on pile axis force and side frictional resistance and the composite-foundation load-settlement behavior by using 2D Finit 巳 Element Method Key word: rigid piJe composite-foundation behaviors cushion bearing capacity 独创性声明 本人严明所呈交的学校论文是本人在导川 rlJ 指导下j进行的研究 l 作和取得的 树究成果，除了文 中特别加以材、1t和敛询j 之处外，论文中 不包含其他人口经发表 或撰写过的研究 成果，川、包 含为获得主主主主或其他教育机构 的学作或ijE t;I的使用过的材料。与