[1]李国奇,贾强,*.桩周土开挖状态带侧向支撑桩稳定性数值分析[J].山东建筑大学学报,2019,34(06):39-44.[doi:10.12077/sdjz.2019.06.007]
 LI Guoqi,JIA Qiang,*.Numerical analysis of pile foundation stability with lateral support under excavation condition of soil around pile[J].Journal of Shandong jianzhu university,2019,34(06):39-44.[doi:10.12077/sdjz.2019.06.007]
点击复制

桩周土开挖状态带侧向支撑桩稳定性数值分析()
分享到:

《山东建筑大学学报》[ISSN:1673-7644/CN:37-1449/TU]

卷:
34
期数:
2019年06期
页码:
39-44
栏目:
研究论文
出版日期:
2019-12-01

文章信息/Info

Title:
Numerical analysis of pile foundation stability with lateral support under excavation condition of soil around pile
文章编号:
1673-7644(2019)06-0039-06
作者:
李国奇1贾强12*
(1.山东建筑大学 土木工程学院,山东 济南 250101;2.建筑结构加固改造与地下空间工程教育部重点实验室,山东 济南 250101)
Author(s):
LI Guoqi1JIA Qiang12*
(1. School of Civil Engineering, Shandong Jianzhu University, Jinan,250101,China;2. Key Laboratory of Building Structural Retrofitting and Underground Space Engineering, Ministry of Education, Jinan,250101,China)
关键词:
桩周土开挖侧向支撑稳定性数值分析
Keywords:
soil excavation around the pile lateral support stability numerical analysis
分类号:
TU473.1
DOI:
10.12077/sdjz.2019.06.007
文献标志码:
A
摘要:
在既有建筑物增设地下空间,需要托换桩支撑上部结构,而随着土方的开挖,桩的稳定性会降低,采用桩身设置侧向支撑是提高桩稳定性的有效方法。文章采用ANSYS软件建立二维有限元模型,分析土方开挖条件下带侧向支撑桩稳定性的变化规律。结果表明:在与桩周土开挖值的比值为0.5倍位置处加设一道支撑时,桩屈曲极限荷载和支撑内力达到最大;桩屈曲极限荷载和支撑内力随着支撑刚度的增加而增大,但当刚度增加到一定数值,荷载值和内力值的增幅不明显;随着支撑数量的增加,桩屈曲极限荷载值逐渐变大,但提高的幅度逐渐降低。
Abstract:
In the existing building, additional underground space is required, and the pile supporting the upper structure is required to excavate the soil below. With the excavation of the earthwork, the stability of the pile will be reduced, and the lateral support of the pile body is an effective method to improve the stability. This paper uses ANSYS to establish a two-dimensional finite element model to analyze the variation of the stability of laterally supported piles under excavation conditions. The results show that the pile buckling ultimate load and the supporting internal force reach the maximum when a support is added at a ratio of 0.5 times the excavation value of the pile surrounding soil. The pile buckling ultimate load and the supporting internal force increase with the increase of the support stiffness. When the stiffness increases to a certain value, the increase of the load value and the internal force value is not obvious. With the increase of the support quantity, the ultimate buckling load value of the pile gradually increases, but the increase range gradually decreases.

参考文献/References:

[1]贾强, 张鑫, 张琳. 既有建筑桩基础开挖过程中承载特性数值分析[J]. 地下空间与工程学报, 2016, 12 (1): 114-118. [2]贾强, 张鑫, 应惠清. 桩基础托换开发地下空间不均匀沉降的数值分析[J]. 岩土力学, 2009, 30 (11): 3500-3504. [3]文颖文, 刘松玉, 胡明亮, 等. 地下增层工程中既有结构变形控制技术研究[J]. 岩土工程学报, 2013, 35 (10): 1914-1921. [4]贾强, 张鑫, 夏风敏, 等. 济南商埠区历史建筑地下增层工程设计与施工[J]. 山东建筑大学学报, 2014,29 (5): 464-469. [5]贾强, 张鑫, 刘磊. 既有建筑地下增层技术的发展与展望[J]. 施工技术, 2018, 47 (3): 84-87. [6]贾强, 栾树, 张鑫. 基于虚拟嵌固点法计算钢管桩稳定性研究[J]. 建筑结构学报, 2017,38 (2): 168-173. [7]单华峰, 夏唐代, 胡军华, 等. 既有建筑物地下室增层开挖桩基屈曲稳定研究[J]. 岩土力学, 2015, 36(S2): 507-512. [8][JP2]Mohammad N, Tanusree C, Vasant M. Nonlinear buckling analysis of slender piles with geometric imperfections[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2015, 141(1):060140141-060140148.[JP] [9]Chen L, Chen Y H, Shi J W, et al. Small-and large-scale model tests on the buckling property of slender pile[J]. Marine Georesources & Geotechnology, 2017, 35(7/8):1058-1067. [10]周万清, 姜德全. 基于m法的高承台桩复合受力计算分析[J]. 路基工程, 2010(05): 41-43. [11]贾强, 李际平, 张全立, 张鑫. 桩周土开挖条件下桩基础屈曲稳定性分析[J]. 山东建筑大学, 2014,29(6): 497-503. [12]贾强, 张鑫. 型钢加水平拉结杆件支撑既有建筑增设多层地下室工艺:中国, 201210407508.4[P]. 2014-07-16. [13]李东. 纵向支撑框架稳定性分析及支撑设计要求[D]. 杭州: 浙江大学, 2005. [14]李际平. 桩周土开挖条件下钢管桩屈曲稳定性试验研究[D]. 济南: 山东建筑大学, 2015. [15]王浩东. 大比尺钢管桩桩周土开挖条件下稳定性试验研究[D]. 济南: 山东建筑大学, 2017. [16]GB 50010—2010, 混凝土结构设计规范[S]. 北京: 中国建筑工业出版社, 2010. [17]JGJ 94—2008, 建筑桩基技术规范[S]. 北京: 中国建筑工业出版社, 2008. [18]JTG D 63—2007, 公路桥涵地基与基础设计规范[S]. 北京: 人民交通出版社, 2007. [19]GB 50017—2017, 钢结构设计规范[S]. 北京: 中国建筑工业出版社, 2018.

相似文献/References:

[1]贾强1,2,李际平1,等.桩周土开挖条件下桩基础屈曲稳定性分析[J].山东建筑大学学报,2014,(06):497.
 Jia Qiang,Li Jiping,et al.Numerical analysis of plies bucking stability reducing caused by soil excavation around the piles[J].Journal of Shandong jianzhu university,2014,(06):497.
[2]贾强,栾树,李际平,等.桩周土开挖条件下钢管桩屈曲稳定性试验研究[J].山东建筑大学学报,2016,(02):103.
 Jia Qiang,LuanShu,Li Jiping,et al.Experimental study of the steel pipe pile bucking stability under excavation conditions[J].Journal of Shandong jianzhu university,2016,(06):103.
[3]贾强,栾树,张鑫.基于虚拟嵌固点法的桩基稳定性数值分析[J].山东建筑大学学报,2017,(01):12.[doi:10.12077/sdjz.2017.01.003]
 Jia Qiang,Luan Shu,Zhang Xin.Numerical analysis of the plies bucking stability based on illusion embedded solid point method[J].Journal of Shandong jianzhu university,2017,(06):12.[doi:10.12077/sdjz.2017.01.003]
[4]贾强,*,黄坤,等.桩周土开挖状态下桩基础荷载传递规律研究[J].山东建筑大学学报,2019,34(01):1.[doi:10.12077/sdjz.2019.01.001]
 JIA Qiang,*,HUANG Kun,et al.Study on loads transmitted laws of the existing building piles caused by soil around piles excavation[J].Journal of Shandong jianzhu university,2019,34(06):1.[doi:10.12077/sdjz.2019.01.001]

备注/Memo

备注/Memo:
收稿日期:2019-10-21 基金项目:国家重点研发计划项目(2017YFC0702900);山东省土木结构防灾减灾协同创新中心项目(SXT17001) 作者简介:李国奇(1993-),男,在读硕士,主要从事既有建筑鉴定加固等方面的研究.E-mail:657133958@qq.com 通讯作者*:贾强(1970-),男,教授,博士,主要从事既有建筑鉴定加固等方面的研究. E-mail:jiaqiang@sdjzu.edu.cn
更新日期/Last Update: 2019-11-18