挤密效应对砂土中水平受荷桩承载特性的影响

胡铠; 苏栋; 余中良; 黄俊杰; 庞小朝

doi:10.11779/CJGE2019S2054

挤密效应对砂土中水平受荷桩承载特性的影响 English Version

胡铠¹,
苏栋^1,2, ,,
余中良³,
黄俊杰¹,
庞小朝^{2, 4}

1. 深圳大学土木与交通工程学院,广东深圳 518060;
2. 深圳大学未来地下城市研究院,广东深圳 518060;
3. 碧桂园集团惠深区域,广东惠州 516347;中国铁道科学研究院深圳研究设计院,广东深圳 518000

基金项目: 国家自然科学基金项目（51878416）

详细信息

作者简介:
胡铠(— ),男,硕士研究生,主要从事土与结构相互作用、岩土数值计算方法等方面的研究。E-mail: 635473986@qq.com。

通讯作者:
苏栋，E-mail：sudong@szu.edu.cn

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出版历程
- 收稿日期: 2019-04-27
- 发布日期: 2019-07-19

Influences of compaction effect on bearing capacity of laterally loaded piles in sand

1. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China;
2. Underground Polis Academy, Shenzhen University, Shenzhen 518060, China;
3. Country Garden Co., Ltd., Huishen Regional, Huizhou 516347, China;
4. Shenzhen Research and Design Institute of China Academy of Railway Sciences, Shenzhen 518000, China

摘要

摘要: 砂土中的挤土桩在实际工程中广泛应用,部分挤土桩长期遭受风荷载、波浪荷载等水平循环荷载的作用,而挤土桩对桩周土体的挤密效应会对桩身水平承载力产生较大影响。通过开、闭口桩的室内模型试验,研究分析了砂土初始相对密度、桩径、长径比等因素对挤土桩单调和循环承载特性的影响。结果表明,在不同密实度砂土中,开口桩水平承载力总体上弱于闭口桩。桩径、长径比和土体相对密度都会对开口桩、闭口桩之间承载力的差值造成较大的影响。循环荷载作用下,松砂中不同桩径和埋深的开口桩、闭口桩的水平承载力都随着加载周期的增加而增大,而在中密砂中,随着循环次数的增加,循环加载后承载力增加的幅度较松砂中的减少,甚至出现下降。
- 单桩 /
- 水平静力加载 /
- 水平循环加载 /
- 挤密效应
Abstract: Displacement piles are widely adopted in practical engineering. Some of the piles are used to resist the horizontal cyclic loadings induced by wind or wave. Based on the model tests conducted on open-end and closed-end piles, the effects of the initial relative density of sand, pile diameter and length-diameter ratio on the static and cyclic bearing capacities are investigated. The results indicate that the bearing capacity of the open-end piles is generally weaker than that of closed-end piles in both loose and medium-dense sands. Difference in the pile diameter, length-diameter ratio, and relative density of sand will result into significant difference in the bearing capacities of the open-end and closed-end piles. Under cyclic loading, the bearing capacity of the piles in loose sand always increases with the number of loading cycles. In the medium dense sand, the increment in the loading capacity as caused by the cyclic loading is smaller than that in the loose sand, and becomes negative in some cases.
- single pile /
- horizontal static loading /
- horizontal cyclic loading /
- compaction effect

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参考文献(6)

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