上海某地铁上盖项目大桁架下桩基础设计的探讨

孙抒宇, 王经雨

结构工程师 ›› 2022, Vol. 38 ›› Issue (6) : 126-133.

PDF(1164 KB)
PDF(1164 KB)
结构工程师 ›› 2022, Vol. 38 ›› Issue (6) : 126-133.
地基基础

上海某地铁上盖项目大桁架下桩基础设计的探讨

  • 孙抒宇*, 王经雨
作者信息 +

Research on Design of Pile Foundation under the Large-Span Truss of a Subway Superstructure Project in Shanghai

  • SUN Shuyu*, WANG Jingyu
Author information +
文章历史 +

摘要

地铁上盖项目一般具有场地受限、基础沉降控制严格的特点,上海某地铁上盖项目因采用大桁架的方式横跨地铁,上部荷载的集中使得大桁架下桩基础设计更为困难。为解决因场地受限桩间距不满足规范要求的问题,本项目采用一种折算方法考虑这一不利因素,计算表明,桩基侧阻承载力经折减后,仍可满足桩基承载力设计要求。分析本项目沉降产生的主要原因,并依据类似工程的资料和试桩数据,对沉降数据进行了分析和预估。研究表明,本工程钻孔灌注桩沉降的主要原因是桩身压缩引起的沉降;大桁架下柱下桩基的沉降较小,能满足地铁对沉降控制的要求;因场地狭小,大桁架下基础桩数受限致使桩基水平抗力不足时,可在承台设置水平传力板的方式解决过大的水平力。

Abstract

Subway superstructure projects generally have the characteristics of limited site and strict foundation settlement control, which brings great challengers to structural design. What is more, in this project, large-span trusses are used to span the subway station, so the design of the pile foundation under the truss system is much more difficult because of the concentration of the load under the truss. To solve the problem that the pile spacing does not meet the code requirements due to the restricted site, this project adopts a new method to consider this adverse condition. The new method calculation results show that the shaft resistance bearing capacity of the pile foundation can still meet the design requirements after being reduced. The main reasons for the settlement of this project are analyzed. Based on the data such as the test pile results of similar projects, the settlement data is researched and estimated. Research shows that the main reason for the settlement of the cast-in-situ pile comes from the compression deformation of the pile body, the settlement of the pile foundation under the large-span truss is very small, which can meet the requirements of the subway settlement limitation. The number of piles under the truss is limited because of the restricted site, the horizontal bearing capacity of the pile foundation is insufficient, therefore, a horizontal force transfer plate is installed on the cap to solve the problem of the excessive horizontal force.

关键词

地铁上盖 / 大桁架 / 桩间距 / 折减系数 / 沉降控制 / 水平力

Key words

subway superstructure / large-span truss / pile spacing / reduction coefficient / settlement control / horizontal force

引用本文

导出引用
孙抒宇, 王经雨. 上海某地铁上盖项目大桁架下桩基础设计的探讨. 结构工程师. 2022, 38(6): 126-133
SUN Shuyu, WANG Jingyu. Research on Design of Pile Foundation under the Large-Span Truss of a Subway Superstructure Project in Shanghai. STRUCTURAL ENGINEERS. 2022, 38(6): 126-133

参考文献

[1] 中华人民共和国住房和城乡建设部.JGJ 94—2008 建筑桩基技术规范[S].北京:中国建筑工业出版社,2008.
Ministry of Housing and Urban-Rural Development of the People's Republic of China.JGJ 94—2008 Technical code for building pile foundations[S].Beijing:China Architecture and Building Press,2008.(in Chinese)
[2] 刘金砺,高文生,邱明兵.建筑桩基技术规范应用手册[M].北京:中国建筑工业出版社,2010.
Liu Jinli,Gao Wensheng,Qiu Mingbing.Application handbook of technical code for building pile foundation[M].Beijing:China Architecture and Building Press,2010.(in Chinese)
[3] 孙璐. 上海某项目地铁上盖综合体结构设计[J].建筑结构,2017,47(14):19-24.
Sun Lu.Structural design of a complex building project over the subway station in Shanghai[J].Building Structure,2017,47(14):19-24.(in Chinese)
[4] 孙宏伟. 京津沪超高层超长钻孔灌注桩试验数据对比分析[J].建筑结构,2011,41(9):143-146.
Sun Hongwei.Compare analysis on loading test data of ultra-long bored piles in Beijing,Tianjin and Shanghai[J].Building Structure,2011,41(9):143-146.(in Chinese)
[5] 戴荣良,陈晖,喻云岩.上海高层建筑桩基土类型特性和沉降分析[J].岩土工程学报,2001,23(5),627-630.
Dai Rongliang,Chen Hui,Yu Yunyan.Subsoil character of pile foundation and settlement analysis of high-rise buildings in Shanghai[J].Chinese Journal of Geotechnical Engineering,2001,23(5),627-630.(in Chinese)
[6] 樊长龙,史华雁,来少平,等.某TOD地铁上盖建筑桩基水平承载力设计[J].建筑结构,2017,47(14):100-105.
Fan Changlong,Shi Huayan,Lai Shaoping,et al.Horizontal bearing capacity design of the pile foundation of a TOD top-head platform building over subway[J].Building Structure,2017,47(14):100-105.(in Chinese)
[7] 上海市住房和城乡建设管理委员会.DGJ08-11—2018地基基础设计规范[S].上海:同济大学出版社,2019.
Management Committee of Housing and Urban-Rural Development of Shanghai.DGJ08-11—2018 Foundation design code[S].Shanghai:Tongji University Press,2019.(in Chinese)
[8] 任光勇,张忠苗,宋仁乾.桩身混凝土在竖向荷载作用下的压缩量试验研究[J].岩石力学与工程学报,2004,23(2):348-354.
Ren Guangyong,Zhang Zhongmiao,Song Renqian.Testing study on compression of pile under vertical load[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(2):348-354.(in Chinese)
[9] 张雁,刘金波.桩基手册[M].北京:中国建筑工业出版,2009.
Zhang Yan,Liu Jinbo.Handbook of pile foundation[M].Beijing:China Architecture and Building Press,2009.(in Chinese)
[10] 赵昕,袁聚云,刘射洪.软黏土地区超高层建筑共同作用体系时变沉降分析及监测[J].结构工程师,2015,31(6):144-151.
Zhao Xin,Yuan Juyun,Liu Shehong.Time-dependent settlement analysis and monitoring in the integrated soil-foundation-structure system of super high-rise buildings in soft clay[J].Structural Engineers,2015,31(6):144-151.(in Chinese)
[11] 中华人民共和国住房和城乡建设部.GB 50010—2010 混凝土结构设计规范[S].北京:中国建筑工业出版社,2015.
Ministry of Housing and Urban-Rural Development of the People's Republic of China.GB 50010—2010 Code for design of concrete structures[S].Beijing:China Architecture and Building Press,2015.(in Chinese)
PDF(1164 KB)

1374

Accesses

0

Citation

Detail

段落导航
相关文章

/