【作者】 钦祥伟；

【导师】 张忠苗；

【作者基本信息】 浙江大学 ， 岩土工程， 2004， 硕士

【摘要】 现阶段，桩筏基础具有良好的承载、减沉、调平(减少沉降差)功能，是高层建筑物或软土地基上建筑物常用的基础形式。桩筏基础的承载力、沉降分析、尤其是建立在桩—土—筏共同作用基础上的以减少差异沉降为目的的调平分析是目前桩筏基础设计中的难点与热点，清楚的了解桩筏基础的工作性状对满足设计目标至关重要。 本文采用专业有限元程序，通过建立二维模型，主要分析和研究了桩筏基础的沉降、内力、桩顶反力等变化规律，讨论了筏板和桩各种参数(筏板形状、厚度、桩长、布桩方式等)对整个基础的沉降和筏板内力的影响。并详细讨论了带裙房桩筏基础在设缝和不设缝情况下的裙房面积大小、主裙楼筏厚不同等情况下内力分布、沉降分布情况。 运用本文的方法对宁波嘉和中心进行桩筏基础优化设计，并详细讨论了主楼、裙楼不同桩长情况下，基础的变形情况和内力分布情况，并对几种布桩方案的经济情况和工期情况进行了详细的比较，达到了安全、经济的目的。更多还原

【Abstract】 Piled raft foundations are ordinarily adopted for the tall building and heavy structure because it possesses large capacity and well performance of reducing settlements and balancing differential settlements.How to reduce differential settlements are the most abstruse and focal problems in design.To achieve to the design objects,its crucial to know the piled raft foundations how to wok.In this paper;I set up 2-dimensions finite element model of piled raft foundations by professional software.The results of caculating many engneering projects show the change of settlement,intemal force and counterforce on pile when parameters are variational.This paper discusses the effects of internal force and the settlement of plate on ground and counterforce on pile of main towers and podiums with settlement joints between them.The method is used in the optimum design of Jiahe Hotel in Ningbo.Four cases are’ discussed and compared ,the best one is chosen because it is economical and safe.更多还原