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基坑分级支护的模型试验研究

郑刚, 聂东清, 程雪松, 刁钰, 刘杰

郑刚, 聂东清, 程雪松, 刁钰, 刘杰. 基坑分级支护的模型试验研究[J]. 岩土工程学报, 2017, 39(5): 784-794. DOI: 10.11779/CJGE201705002
引用本文: 郑刚, 聂东清, 程雪松, 刁钰, 刘杰. 基坑分级支护的模型试验研究[J]. 岩土工程学报, 2017, 39(5): 784-794. DOI: 10.11779/CJGE201705002
ZHENG Gang, NIE Dong-qing, CHENG Xue-song, DIAO Yu, LIU Jie. Experimental study on multi-bench retaining foundation pit[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(5): 784-794. DOI: 10.11779/CJGE201705002
Citation: ZHENG Gang, NIE Dong-qing, CHENG Xue-song, DIAO Yu, LIU Jie. Experimental study on multi-bench retaining foundation pit[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(5): 784-794. DOI: 10.11779/CJGE201705002

基坑分级支护的模型试验研究  English Version

基金项目: 国家科技支撑计划项目(2012BAJ01B02-03); 国家自然科学基金项目(51308389); 国家自然科学基金重点项目(41630641); 天津市自然科学基金项目(14CQNJC0750)
详细信息
    作者简介:

    郑 刚(1967- ),男,博士,教授,博士生导师,从事土力学及岩土工程教学与科研工作。E-mail:zhenggang1967@163.com。

  • 中图分类号: TU473.2

Experimental study on multi-bench retaining foundation pit

  • 摘要: 对大面积基坑,条件适当时采用多级支护可以取消水平支撑,目前已经有一些应用。而针对多级支护工作机理的研究却相对较少。进行了大型模型试验,研究了两级支护间土体水平距离B及第二级支护桩桩长L2这两个主要参数对多级支护变形、受力及破坏模式的影响。根据B的不同,多级支护存在整体式、关联式和分离式三种破坏模式,3种破坏模式的主要区别在于破坏面的范围及两级支护间土体的应力状态不同。第一级桩的桩顶位移及桩身弯矩分别随B的增加而减小,基坑稳定性增加。而L2的增加会导致第二级桩转变为主要受力结构,即第二级桩承受更大的弯矩,两级桩桩身弯矩分配更加均匀,L2的增加同样有利于减小第一级桩桩顶位移。
    Abstract: In deep excavations with a large area of soft soil, the multi-bench retaining method, which has a short construction period and doesn’t need any horizontal reinforced concrete struts, can be used to replace the method with reinforced concrete struts. This method has been used in some regions of China. Because of the lack of researches on the multi-bench retaining method, a serious of model tests are designed to learn its work and failure mechanism. The main parameters, width of the bench between retaining piles B and length of the second retaining pile L2, are studied. The test results show that the multi-bench retaining structure has three kinds of failure modes, the overall overturning failure, the mutual-effect failure and the separate failure, according to different widths of the bench between retaining piles. The main differences of these failure mechanisms are the range of the slip surface and the stress condition of the soil between retaining piles. As the width of the bench increases, the deformation and moment of the retaining piles decease and have better stability. The second retaining pile will become the main retaining structure, which means that the second retaining pile bears a larger moment than the first one, with a long second retaining pile. The increase of L2 can also decrease the displacement of the first retaining pile and improve the stability.
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出版历程
  • 收稿日期:  2016-02-20
  • 发布日期:  2017-05-24

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