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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

29卷

期数:

2012年03期

页码:

49-54

栏目:

出版日期:

2012-09-30

文章信息/Info

Title:

Vertical Uplift Capacity Characteristics and Influence Factor Analysis of Cast-in-situ X-section Reinforced Concrete Pile Group

作者:

孔纲强^1,2,丁选明^1,2,陈育民^1,2,杨贵^1,2

1. 河海大学 岩土力学与堤坝工程教育部重点实验室,江苏 南京 210098; 2. 河海大学 土木与交通学院,江苏 南京 210098

Author(s):

KONG Gang-qiang^1,2, DING Xuan-ming^1,2, CHEN Yu-min^1,2, YANG Gui^1,2

1. Key Laboratory of Geomechanics and Embankment Engineering, Ministry of Education, Hohai University, Nanjing 210098, Jiangsu, China; 2. School of Civil and Transportation Engineering, Hohai University, Nanjing 210098, Jiangsu, China

关键词:

软土地基;  现浇X形桩;  抗拔承载力;  群桩;  轴力;  摩擦因数

Keywords:

soft soil foundation;  cast-in-situ XCC pile;  uplift bearing capacity;  pile group;  axial force;  fraction coefficient

分类号:

TU473

DOI:

-

文献标志码:

A

摘要:

结合南京某污水处理厂软基处理工程,开展了现浇X形钢筋混凝土桩(简称X形桩)单桩竖向抗拔承载力现场试验,测得了荷载-位移关系曲线; 基于FLAC3D软件建立了竖向上拔荷载作用下X形单桩、群桩特性分析的数值模型,并与现场单桩抗拔试验结果进行对比分析; 比较研究了与等效圆形截面桩抗拔承载力的差异,并分析了基桩长度、桩-土摩擦因数以及基桩位置等因素对X形群桩力学特性的影响规律。研究结果表明:X形桩竖向抗拔承载力与其等外包直径的圆形截面桩承载力相近,较等混凝土用量的圆形截面桩承载力提高了近17.4%。

Abstract:

Based on Nanjing Sewage Treatment Plant soft ground improvement engineering, field tests of X-section cast-in-situ reinforced concrete pile(referred to as XCC pile)under vertical uplift bearing capacity were carried out, in which the relation curves of load-displacement were measured. Numerical models for XCC single pile and pile group under uplift load were built by using FLAC3D software. The simulation result was compared with single pile field test result. Comparing analysis with the bearing capacity of circular piles under uplift load was carried out. Then, the mechanical properties of XCC pile group which were influenced by pile length, pile-soil fraction coefficient and pile position were analyzed and discussed. The study results show that the vertical uplift bearing capacity of XCC pile is relatively equals to that of circular pile with the same out-diameters, nearly 17.4% larger than that of circular pile with the same concrete volumes.

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相似文献/References:

[1]王晓平,朱海涛,李忠献,等.天津滨海新区典型软土地基强夯法有限元分析[J].建筑科学与工程学报,2014,31(02):105.
　[J].Journal of Architecture and Civil Engineering,2014,31(03):105.
[2]李镜培,马原,杨培芳,等.软土地基高真空击密法与低位高真空分层预压击密法加固效果分析[J].建筑科学与工程学报,2011,28(02):79.
　LI Jing-pei,MA Yuan,YANG Pei-fang,et al.Analysis of Strengthening Effect of HVDM with SHVLPDM in Soft Soil Foundation[J].Journal of Architecture and Civil Engineering,2011,28(03):79.
[3]曹文昭,杨志银,蔡巧灵,等.软土地基超长桩静载试验中桩侧堆载影响分析[J].建筑科学与工程学报,2021,38(06):1.[doi:10.19815/j.jace.2021.08049]
　CAO Wen-zhao,YANG Zhi-yin,CAI Qiao-ling,et al.Effect of Surrounding Load on Static Load Test of Super-long Pile in Soft Soil Foundation[J].Journal of Architecture and Civil Engineering,2021,38(03):1.[doi:10.19815/j.jace.2021.08049]

备注/Memo

备注/Memo:

收稿日期:2012-06-20
基金项目:国家自然科学基金联合基金项目(U1134207); 国家自然科学基金青年科学基金项目(51008116)
作者简介:孔纲强(1982-),男,浙江金华人,副教授,工学博士,E-mail:gqkong1@163.com。

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更新日期/Last Update: 2012-09-20