[1]邓宏科,史永跃.基桩竖向加载极限承载力现场试验研究[J].高速铁路技术,2023,14(06):13-18.[doi:10.12098/j.issn.1674-8247.2023.06.003]
 DENG Hongke,SHI Yongyue.Field Test of Ultimate Bearing Capacity of Foundation Pile under Vertical Loading[J].HIGH SPEED RAILWAY TECHNOLOGY,2023,14(06):13-18.[doi:10.12098/j.issn.1674-8247.2023.06.003]
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基桩竖向加载极限承载力现场试验研究()
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《高速铁路技术》[ISSN:1674-8247/CN:51-1730/U]

卷:
14卷
期数:
2023年06期
页码:
13-18
栏目:
理论探索
出版日期:
2023-12-30

文章信息/Info

Title:
Field Test of Ultimate Bearing Capacity of Foundation Pile under Vertical Loading
文章编号:
1674-8247(2023)06-0013-06
作者:
邓宏科1史永跃2
1.中铁二院工程集团有限责任公司, 成都 610031;2.中铁西南科学研究院有限公司,成都 611731
Author(s):
DENG Hongke1SHI Yongyue2
1.China Railway Eryuan Engineering Group Co. , Ltd. , Chengdu 610031 , China;2.China Railway Southwest Research Institute Co. ,Ltd. , Chengdu 611731 ,China
关键词:
静力试桩极限承载力“V”型法则Q-s曲线桩端位移
Keywords:
static test pileultimate bearing capacity“V”ruleQ-s curvepile tip displacement
分类号:
TU473.1
DOI:
10.12098/j.issn.1674-8247.2023.06.003
文献标志码:
A
摘要:
基桩极限承载力判定是工程界研究的热点和难点。为掌握加载过程中桩侧及桩端阻力的分布和位移变化规律,在同一试桩进行了两次现场原型桩静力试桩试验,研究了静载试验的Q-s曲线、轴力及端阻的承载机理、变形及破坏特征,结果表明:(1)加载方法、试验先后顺序及加载量级对基桩的承载特性和变形具有明显的影响;(2)在极限承载力附近减小每级加载量,缓变形Q-s曲线的基桩在首次破坏时,桩端会发生一个突然向下的脉冲式反弹,呈倒“V”字型,其尖点的前一级荷载可以作为该桩的极限承载力。研究成果对工程桩的设计和检测具有重要指导意义。
Abstract:
Determining the ultimate bearing capacity of foundation piles is a hot topic and a challenge in the engineering field. In order to understand the distribution and displacement changes of pile side resistance and pile tip resistance during the loading process,two onsite prototype pile static loading tests were conducted on the same test pile. The study explored the Q-s curve of static load tests,the bearing mechanism of axial force and end resistance,deformation,and failure characteristics. The results show:(1)The loading method,sequence of tests,and scale of loading will significantly affect the bearing characteristics and deformation of the foundation pile.(2)When the load is reduced at each stage near the ultimate bearing capacity,the foundation pile with the slow deformation Q-s curve will experience a sudden pulse rebound downwards at the pile tip during the first failure,forming an inverted“V”shape. The load at the point preceding the tip of the“V”can be taken as the ultimate bearing capacity of that pile. The results of this study have important guiding significance for the design and testing of engineering piles.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2023-01-16
作者简介:邓宏科(1977-),男,高级工程师。
更新日期/Last Update: 2023-12-30