工字形布桩群桩基础在大跨度拱形建筑结构中的应用  

Application of I-shaped pile group foundation in long-span arch building structure

作　　者：苏恒强 陈志海 何军 何岸[2] SU Hengqiang;CHEN Zhihai;HE Jun;HE An(Guangdong Architectural Design&Research Institute Co.,Ltd.,Guangzhou 510010,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510641,China)

机构地区：[1]广东省建筑设计研究院有限公司,广州510010 [2]华南理工大学土木与交通学院,广州510641

出　　处：《建筑结构》2022年第21期134-138,共5页Building Structure

基　　金：广东省基础与应用基础研究基金联合基金-青年基金项目(2021A1515110109)。

摘　　要：大跨度拱形建筑结构在拱脚处会产生较大双向水平推力,因此此类建筑结构的群桩基础基桩数量众多。为研究此类基桩数量众多的群桩基础各排基桩的受力特性,结合某大跨度拱形建筑,采用三维有限元软件PLAXIS 3D建立地基土及群桩基础模型。通过对不同桩中心间距的矩形布桩群桩基础计算各排基桩受到的桩周土体作用力,得到本项目桩中心间距为桩径的2.5倍是较优解的结论。此外,还得到如下一些可借鉴应用于相似项目的有益结论:基桩数量众多的群桩基础的前两排基桩及外侧基桩(不包含最后一排内部基桩)受到的桩周土体作用力较大,可为群桩基础提供较大的抗侧刚度;并以此提出一种能高效抵抗拱脚水平推力的工字形布桩群桩基础。The large-span arch building structure generates a large two-way horizontal thrust at the arch foot,so the number of foundation piles of this type building structure is large.In order to study the mechanical characteristics of each row of piles in pile group foundations with a large number of piles,combined with a large-span arched building,the three-dimensional finite element software PLAXIS 3 D was used to establish the foundation soil and pile group foundation model.By calculating the soil force around the piles received by each row of foundation piles for the rectangular pile group foundations with different pile center distance,it is concluded that the optimal solution is the pile center distance of 2.5 times the pile diameter in this project.In addition,the following useful conclusions can be drawn and applied to similar projects:the first two rows of foundation piles and the outer foundation piles(excluding the inner piles in the last row)of pile group foundations with a large number of piles are subjected to large soil forces around the piles,which can provide a large lateral stiffness for the pile group foundations.Based on this,an I-shaped pile group foundation which can effectively resist the horizontal thrust of arch foot was proposed.

关 键 词：大跨度拱形建筑 拱脚 水平推力 桩中心间距 矩形布桩群桩基础 工字形布桩群桩基础 

分 类 号：TU470.3[建筑科学—结构工程]