桩土变形计算模型和变刚度调平设计  

The modified model of pile-soil deformation calculation and variable rigidity design method for balance settlement

作　　者：刘金砺[1] 迟铃泉[1] 

机构地区：[1]中国建筑科学研究院地基基础研究所,北京100013

出　　处：《岩土工程学报》2000年第2期151-157,共7页Chinese Journal of Geotechnical Engineering

摘　　要：不同基宽压缩层深度、基础和桩侧土变形范围、双桩相互影响系数以及桩顶荷载分布的测试结果说明 ,土 -土、桩 -土、桩 -桩相互作用效应较连续介质弹性理论值明显弱化。这是导致按弹性理论计算沉降和相互作用影响偏大的基本原因。本文提出土 -土、桩 -土、桩 -桩相互作用影响计算修正模型 ,应用于高层建筑地基 -基础 -上部结构共同作用计算 ,工程验证表明实测沉降等值线与计算接近 ;并提出共同作用变刚度调平优化设计概念与方法 ,应用于 7项工程 ,收到了大幅节约桩基造价、减小差异沉降的效果。The measured results of settlement depth for foundations with different breadth,soil deformation area around pile and foundation,interaction coefficient of double pile and load distribution on pile top beneath cap illustrate that the effects of interaction of soil-soil, pile-soil and pile-pile are obviously lower than elastic theory values. It is the fundamental reason why the calculated values of settlement and interaction effect, according to elastic theory,are larger than those measured.The modified calculation models for interaction of soil-soil, pile-soil and pile-pile,are proposed and used in the calculation method for soil-foundation-superstructure interaction of tall building. This paper presents the balance settlement optimum design method based on variable rigidity, which has been applied in 7 projects with excellent results obtained.

关 键 词：高层建筑 共同作用 变刚度 调平设计 地基-结构 

分 类 号：TU435[建筑科学—岩土工程] TU473[建筑科学—土工工程]