大直径长桩基础承载变形特性的“分区法”和“类比法”计算模型探讨.docVIP

精品论文 参考文献 大直径长桩基础承载变形特性的“分区法”和“类比法”计算模型探讨 田术永 　　（中国土木工程集团有限公司，北京，100038） 　　The analogy method and Zoning Method of Large Diameter and Super-long Pile Bearing and Deformation Characteristics 　　TIAN Shu Yong 　　【摘 要】目前国内建筑地基基础设计规范中规定的中长桩设计计算方法不能较好的吻合超高层建筑目前常采用的长桩或超长桩基础承载和变形机理。本文综合对比分析和研究了国内大量超高层建筑的桩基设计、桩基础沉降及单桩载荷试验等工程实践及实测资料，探讨了大直径长桩或超长桩基桩的承载特性、荷载传递机理、承载及变形影响因素及单、群桩基础在在设计过程中应重点关注的问题。根据对长桩或超长桩单桩承载变形规律总结分析，探讨和提出了确定单桩极限承载力的“类比法”和确定单桩设计荷载和极限荷载下桩顶位移计算的“分区法”的计算模型；根据对长桩或超长桩群桩考虑上部结构基础—桩—土共同作用的承载变形规律总结分析，探讨和提出了超高层建筑群桩基础的沉降计算思路。以期本文所提出的见解、方法或建议引起同行进行进一步的研究和探讨，并能在工程实践应用时予以参考。 　　【关键词】长桩或超长桩；承载及变形特性；类比法；分区法；设计计算方法 　　【Abstract】At present, the design and calculation method of middle long pile in the “Building Foundation Design Code” are not suitable for the bearing and deformation mechanism of long pile or super long pile which are often used in super high-rise building. In this paper, a comprehensive comparative analysis and study of a large number of high - rise buildings of the long pile or super long pile foundation design, pile foundation settlement and single pile load test data and engineering practice, the large diameter long piles and super long piles of the bearing characteristic, the load transfer mechanism, the influence factors and the key problem for single or skirt pile design were discussed. Based on the analysis of the bearing and deformation characteristics of long pile or super long pile, the analogy method for determining the ultimate bearing capacity of single pile ，and the Zoning Method for determining the pile top displacement under the design load and ultimate load of single pile is put forward. Based on the analysis of the bearing and deformation characteristic of the interaction of superstructure-foundation-pile-soil are considered, a idea is put forward to calculate the settlement of high-rise building skirt pile foundation. Its hopeful that the author puts forward the ideas, methods and suggestions in this paper for further research and discussion, and