砂土中静压桩挤土时效性的室内应变保持试验研究

郭进军; 施建勇

doi:10.13204/j.gyjz200907018

砂土中静压桩挤土时效性的室内应变保持试验研究

doi: 10.13204/j.gyjz200907018

郭进军¹,
施建勇²

1.
1. 洛阳理工学院土木工程系,河南洛阳 471023;
2.
2. 河海大学岩土工程研究所,南京 210098

详细信息

作者简介:
郭进军，男，1973年7月出生，高级工程师，硕士。E-mail:guojinjun@lit.edu.cn

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出版历程
- 收稿日期: 2009-01-15
- 刊出日期: 2009-07-20

LABORATORY STRAIN-HOLDING TESTS OF SET-UP OF JACKED-IN PILES IN SAND

Guo Jinjun¹,
Shi Jianyong²

1.
1. Luoyang Institute of Science and Technology,Luoyang 471023,China;
2.
2. Geotechnical Research Institute of Hohai University,Nanjing 210098,China

摘要

摘要: 工程实践中发现砂土中的挤土桩承载力亦有时效性，超静孔隙水压力消散理论无法解释该现象。利用应力路径三轴仪进行应变保持试验，模拟沉桩及随后的桩周土体的应力状态和物理性质的改变，经分析试验结果得出，砂土中静压桩承载力时效性是由于桩周土体蠕变膨胀引起桩壁上作用的水平应力增大的结果。
- 砂土 /
- 静压桩承载力 /
- 时效性 /
- 应变保持试验
Abstract: It is well-established that the shaft capacity of piles jacked-in increases with time.In clays,this behaviour arises predominantly from the dissipation of positive excess pore pressures.In sands,this increase in the absence of pore pressure dissipation can't be attributed to the aforementioned mechanisms.A series of triaxial strain-holding tests are conducted,and a hypothesis is proposed to explain pile set-up in sand that an increase in radial stress due to restrained creep dilation of the soil close to the pile shaft causes an increase in shaft resistance.
- sand /
- bearing capacity of jacked-in pile /
- pile set-up /
- strain-holding tests

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参考文献(12)

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