大口径钢管斜桩竖向承载特性数值模拟与现场试验研究

doi:10.16285/j.rsm.2017.08.033

›› 2017, Vol. 38 ›› Issue (8): 2434-2440.doi: 10.16285/j.rsm.2017.08.033

大口径钢管斜桩竖向承载特性数值模拟与现场试验研究

徐江^{1, 2}，龚维明^{1, 2}，张琦^{1, 2}，戴国亮^{1, 2}，霍少磊^{1, 2}，杨超^{1, 2}

1. 东南大学土木工程学院，江苏南京 210096；2. 东南大学混凝土及预应力混凝土结构教育部重点实验室，江苏南京 210096

收稿日期:2015-09-08 出版日期:2017-08-11 发布日期:2018-06-05
作者简介:徐江，男，1988年生，博士研究生，主要从事岩土工程方面的研究工作。
基金资助:
江苏省普通高校学术学位研究生科研创新计划（No. KYLX16-0238）；国家自然科学基金项目（No. 51478109）；国家重点基础研究发展计划（No. 2013CB036304）。

Numerical simulation and field test study on vertical bearing behavior of large diameter steel of inclined piles

XU Jiang^{1, 2}, GONG Wei-ming^{1, 2}, ZHANG Qi^{1, 2}, DAI Guo-liang^{1, 2}, HUO Shao-lei^{1, 2}, YANG Chao^{1, 2}

1. School of Civil Engineering, Southeast University, Nanjing, Jiangsu 210096, China; 2. Key Laboratory of C and PC Structure of Ministry of Education, Southeast University, Nanjing, Jiangsu 210096, China

Received:2015-09-08 Online:2017-08-11 Published:2018-06-05
Supported by:
This work was supported by the Research Innovation Program for College Graduates of Jiangsu Province (KYLX16-0238), the National Natural Science Foundation of China (51478109) and the National Basic Research Program of China(2013CB036304).

摘要/Abstract

摘要： 目前对倾斜桩现场试验的研究比较少。结合东海大桥风电场二期项目，对40#和41#风机桩位处的4根（2根直桩，2根倾斜桩）试桩用自平衡法进行了竖向承载力现场试验。在试验之前运用有限元软件ABAQUS在合理建模及选取土体参数的条件下对直桩及倾斜桩进行了前期分析，计算结果与后期试验结果接近，将计算及试桩结果进行了分析对比得到：（1）在该工程场地条件下，有限元计算及试验结果均表明斜桩（倾角12°）的竖向极限承载力小于直桩的竖向极限承载力；（2）有限元结果表明，倾斜桩在轴向荷载的作用下，背斜侧土体的沉降值及沉降范围要明显大于向斜侧；（3）试验表明，有限元分析及土体参数的取值是比较合理的，可以为类似工程前期分析提供参考；（4）试验结果表明，2根直桩的极限承载力小于设计值，2根斜桩的极限承载力大于设计值，2根斜桩的桩端阻力所占比例高于2根直桩，桩侧阻力所占比例低于2根直桩。

关键词: 大口径钢管桩, 倾斜桩, 有限元分析, 现场试验, 竖向承载特性

Abstract: Currently, there are few studies on inclined pile field test. Four piles at the position of 40 # and 41 # fans (two vertical piles, two inclined pile) were tested for their vertical bearing capacity in Donghai Bridge Wind Farm Phase II project. Prior to testing, the ABAQUS was used for preliminary analysis on vertical piles and inclined piles under reasonable conditions and selected soil parameters. it found that the calculated results and post-test results are close, and after comparing calculated results and the results of test piles, it showed: 1) at the project site conditions, finite element analysis and experimental results showed that the vertical ultimate bearing capacity of inclined pile was less than vertical ultimate bearing capacity of vertical pile. 2) when the inclined pile was under axial load, the settlement and the settlement value range on the anticline side of the soil were significantly greater than that on the oblique side; 3) the finite element analysis and the parameter value were more reasonable, which could provide reference for similar project preliminary analysis; 4) ultimate bearing capacity of the two vertical piles was less than design value: ultimate bearing capacity of the two inclined piles was greater than the design value; the proportion of pile side resistance of the two inclined piles was higher than that of two vertical piles; the proportion of pile side resistance was lower than two vertical piles.

Key words: large diameter steel pile, inclined piles, finite element analysis, field test, vertical bearing behavior

中图分类号:

TU 473.1

徐江，龚维明，张琦，戴国亮，霍少磊，杨超, . 大口径钢管斜桩竖向承载特性数值模拟与现场试验研究[J]. , 2017, 38(8): 2434-2440.

XU Jiang, GONG Wei-ming, ZHANG Qi, DAI Guo-liang, HUO Shao-lei, YANG Chao ，. Numerical simulation and field test study on vertical bearing behavior of large diameter steel of inclined piles[J]. , 2017, 38(8): 2434-2440.

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大口径钢管斜桩竖向承载特性数值模拟与现场试验研究

Numerical simulation and field test study on vertical bearing behavior of large diameter steel of inclined piles

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