砂流法施工致沉管隧道管段竖向位移的试验研究

黎伟; 房营光; 莫海鸿; 谷任国; 陈俊生; 袁伟耀

砂流法施工致沉管隧道管段竖向位移的试验研究 English Version

黎伟^{1, 2, 3},
房营光^{1, 2},
莫海鸿^{1, 2},
谷任国^{1, 2},
陈俊生^{1, 2},
袁伟耀⁴

1. 华南理工大学土木与交通学院，广东广州 510641; 2. 华南理工大学亚热带建筑科学国家重点实验室，广东广州 510641; 3. 广州电力设计院，广东广州 510075; 4. 东莞建青建筑设计有限公司，广东东莞 523000

基金项目: 致谢：本课题得到了广州市中心区交通建设有限公司的资助，得到了广州市市政工程设计研究院、中交第四航务工程局有限公司、交通运输部广州打捞局等单位的帮助；试验过程中得到了王一兆、冯德銮博士等人的帮助；论文写作过程中得到了黄文锋博士的帮助，在此一并表示衷心感谢。

详细信息

作者简介:
黎伟 (1985- )，男，湖南岳阳人，博士研究生，主要从事岩土工程及地下结构等方面的研究工作。E-mail: wl_scut@163.com。

中图分类号: U455
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出版历程
- 收稿日期: 2012-09-17
- 发布日期: 2013-06-19

Vertical displacement of tube segment of immersed tunnels caused by sand flow construction

LI Wei^{1, 2, 3},
FANG Ying-guang^{1, 2},
MO Hai-hong^{1, 2},
GU Ren-guo^{1, 2},
CHEN Jun-sheng^{1, 2},
YUAN Wei-yao⁴

1. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China; 2. State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510641, China; 3. Guangzhou Electric Power Design Institute, Guangzhou 510075, China; 4. Dongguan Jian-Qing Architectural Design Co., Ltd., Dongguan 523000, China

摘要

摘要: 利用足尺砂流法模型试验模拟了砂流法处理沉管隧道地基施工致使管节竖向位移的全过程，获得了管节模型的相对高程-时程曲线、竖向位移量及砂盘的形态特征。结果表明：模型在试验中先后经历了砂盘正常扩展、缓慢跳动位移、快速平稳位移3个阶段；模型在缓慢跳动位移过程中的位移量、位移速率均较快速平稳位移过程中的要小。模型板的竖向位移使得流缝区域缩小，流槽厚度变薄且密集分布于砂盘顶面（占砂盘顶面积的30%以上）；砂颗粒压积于砂盘顶部形成水平薄层状结构，是模型板竖向位移的直接原因；模型板竖向位移过程明显影响砂盘的半径扩展。工程实践中可适当利用管节的缓慢跳动位移过程减小流缝、流槽厚度，但需采取措施保证砂盘半径在管节产生竖向位移前达到设计值。
- 沉管隧道 /
- 地基处理 /
- 砂流法 /
- 足尺模型试验 /
- 管段竖向位移
Abstract: By using the full-scale model tests on the sand-flow method, the whole process of vertical displacement of tube segment in the construction of immersed tunnel foundation treated by sand-flow method is simulated. The relative elevation versus time-history curves of the tube segment model, the amount of vertical displacement and the morphological characteristics of the sand deposit are obtained. The test results show that the model tests have three processes, that is, normal expansion of sand deposit, slow-beating displacement and fast-smooth displacement. The displacement amount and displacement rate of model in the slow-beating displacement process are smaller than those in the fast-smooth displacement process. The vertical displacement makes the gap area small and the chutes thin and densely distributed on the top surface of the sand deposit. Sand particles cumulate on the sand-deposit top and form horizontal layers, which causes the vertical displacement directly. The displacement process significantly affects the expansion of the sand deposit. The process of the slow-beating displacement can be used to reduce the thickness of the gap and chutes in engineering practice, but measures should be taken to ensure that the sand deposit radius meet the design requirements before the vertical displacement.
- immersed tube tunnel /
- foundation treatment /
- sand flow method /
- full-scale model test /
- vertical displacement of tube segment

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参考文献(21)

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