超深开挖对坑底桩的抗压承载力及沉降特性的影响因素研究

刁钰; 李光帅; 郑刚

doi:10.11779/CJGE2017S2050

超深开挖对坑底桩的抗压承载力及沉降特性的影响因素研究 English Version

刁钰^{1, 2},
李光帅^{1, 2},
郑刚^{1, 2}

1. 滨海土木工程结构与安全教育部重点实验室（天津大学）,天津 300072;
2. 天津大学土木系,天津 300072

基金项目: 国家自然科学基金资助项目（51308389）

详细信息

作者简介:
刁钰(1982- ),男,副教授,从事岩土与地下工程的教学与研究。E-mail: yudiao@tju.edu.cn。

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出版历程
- 收稿日期: 2017-08-01
- 发布日期: 2017-12-19

Influencing factors of deep excavation on bearing capacity and settlement of piles beneath excavation

DIAO Yu^{1, 2},
LI Guang-shuai^{1, 2},
ZHENG Gang^{1, 2}

1. Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University, Tianjin 300072, China;
2. Department of Civil Engineering, Tianjin University, Tianjin 300072, China

摘要

摘要: 超深基坑的开挖会对坑底工程桩的抗压承载力和沉降特性产生影响,但是目前对开挖深、宽度、有效桩长等影响因素的研究较少。通过模拟对比套管试桩和开挖后坑底试桩两种工况,可以反映开挖对桩的承载力和竖向刚度的影响。研究发现,以坑底桩的开挖前承载力和刚度为基准进行归一,得到的相对承载力和相对竖向刚度,随着相对开挖宽度和相对开挖深度的增大而降低,随着相对有效桩长的增长而提高。
- 深开挖 /
- 抗压桩 /
- 承载力 /
- 有限元法 /
- 荷载试验
Abstract: The deep excavation has a significant influence on the bearing capacity and settlement of piles beneath excavation. However, there are few researches on the influencing factors, especially the distribution of strata. In this study two types of pile load tests are simulated. One is the pile load tests with pile casing in excavation range (TS), and the other is the pile load tests after excavation (TE). Through analyzing and comparing the results of tests, such as load-settlement relationship and skin friction, the effect of deep excavation on the bearing capacity and vertical stiffness can be obtained. It is found that the relative bearing capacity and relative vertical stiffness decrease with the increase of the relative width and depth of excavation. They increase with the increase of the relative effective pile length.
- deep excavation /
- compressive pile /
- bearing capacity /
- FEM /
- load test

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参考文献(15)

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