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复杂环境下某深厚软土基坑的实测性状研究

应宏伟, 孙威, 吕蒙军, 陈东

应宏伟, 孙威, 吕蒙军, 陈东. 复杂环境下某深厚软土基坑的实测性状研究[J]. 岩土工程学报, 2014, 36(zk2): 424-430. DOI: 10.11779/CJGE2014S2074
引用本文: 应宏伟, 孙威, 吕蒙军, 陈东. 复杂环境下某深厚软土基坑的实测性状研究[J]. 岩土工程学报, 2014, 36(zk2): 424-430. DOI: 10.11779/CJGE2014S2074
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YING Hong-wei, SUN Wei, LÜ Meng-jun, CHEN Dong. Measured characteristics of a deep soft soil excavation in complex environment[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(zk2): 424-430. DOI: 10.11779/CJGE2014S2074
Citation: YING Hong-wei, SUN Wei, LÜ Meng-jun, CHEN Dong. Measured characteristics of a deep soft soil excavation in complex environment[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(zk2): 424-430. DOI: 10.11779/CJGE2014S2074
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复杂环境下某深厚软土基坑的实测性状研究  English Version

  • 1. 浙江大学滨海和城市岩土工程研究中心,浙江 杭州 310058;
    2. 浙江大学软弱土与环境土工教育部重点实验室,浙江 杭州 310058;
    3. 杭州运河集团投资发展有限公司,浙江 杭州 310014;
    4. 浙江省建筑设计研究院,浙江 杭州 310006

基金项目: 国家自然科学基金项目（51278462）; 浙江省建设厅科技推广应用研究项目
详细信息
    作者简介:

    应宏伟(1971- ),男,副教授,主要从事岩土工程的教学和科研工作。E-mail: ice898@zju.edu.cn。

Measured characteristics of a deep soft soil excavation in complex environment

  • 1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058,China;
    2. MOE, Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education, Zhejiang University, Hangzhou 310058, China;
    3. The Hangzhou canal group investment and Development Co., Ltd., Hangzhou 310014, China;
    4. Zhejiang Province Institute of Architectural Design and Research, Hangzhou 310006, China

摘要

    摘要
  • 摘要: 详尽分析了杭州某上部带有较厚硬壳层的深厚软黏土地基中,开挖深度为17.4~19.8 m,采用地下连续墙和多层钢筋混凝土支撑作为支护结构的超深基坑工程的实测性状。现场监测内容包括基坑侧壁土体水平位移、坑外地表沉降及内支撑轴力。研究表明,本案例基坑的最大水平位移与基坑最大开挖深度之比介于0.24%~0.75%,最大水平位移超过100 mm,其中蠕变变形占总侧向变形的比例高达44%~56%,基坑水平位移蠕变速率为0.15~0.76 mm/d,蠕变速率与基坑开挖深度和基底附近土层性质有密切关系;“T”型地下连续墙和隔断墙技术对减小侧壁土体变形有一定作用。基坑坑外横向地面沉降大致呈抛物线分布,坑外纵向沉降大致呈马鞍形,地表周围土体最大沉降与基坑最大开挖深度之比介于0.26%~0.7%,最大沉降量与坑壁最大侧向位移量的关系大致为~,沉降蠕变速率为0.1~0.6 mm/d。随着开挖及相邻支撑的浇筑及拆除,多层支撑支护结构中各层支撑的轴力不断变化。
    Abstract: The monitoring data of a 17.4 m~19.8 m-deep multi-strutted soft clay excavation built on hard shell layer soft soil foundation in Hangzhou is analyzed. The deep excavation is supported by a concrete diaphragm wall and multi-storey reinforced concrete brace. The monitoring includes soil and wall deflections, surface and subsurface ground settlements, axial forces of concrete struts. This study shows that the maximum horizontal displacements are 0.24%Hm~0.75%Hm, in which Hm is the total excavation depth. The maximum horizontal displacement is larger than 100 mm, in which the proportions of creep deformation reach up to 44%~56%. The horizontal creep rates are in 0.15~0.76 mm/d and closely related with the excavation depth and the properties of the soils near the base. The technology of T-diaphragm wall and partition wall can reduce the horizontal displacement of the excavation to some extent. The distribution of the lateral settlement is in a parabolic shape and the longitudinal settlement is in a saddle shape. The maximum settlements are 0.26%Hm ~0.7%Hm and the settlement rates are 0.1~0.6 mm/d. The relationship between the maximum settlements is between and 2.57, in which is the maximum horizontal displacement. The axial forces of the struts change dynamically during the excavation and construction or removal of the adjacent braces.
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    • 参考文献(11)
  • [1] PECK R B. Deep excavation & tunneling in soft ground[C]// Proc 7th International Conference on Soil Mechanics and Foundation Engineering. Mexiocity, 1969: 225-281.
    [2] MANA A I, CLOUGH G W. Prediction of movements for braced cuts in clay[J]. Journal of Geotechnical Engineering Division, ASCE, 1981, 107(6): 759-777.
    [3] OU C Y, LIAO J T, LIN H D. Performance of diaphragm wall constructed using the top-down method[J]. Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 1998, 124(9): 798-808.
    [4] LONG M. Database for retaining wall and ground movements due to deep excavations[J]. Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 2001, 127(3): 203-224.
    [5] LIU G B, NG C W W, WANG Z W. Observed performance of a deep multi-strutted excavation in Shanghai soft clays[J]. Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 2005, 131(8): 1004-1013.
    [6] WANG J H, XU Z H, WANG W D. Wall and ground movements due to deep excavations in Shanghai soft soils[J]. Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 2010, 136(7): 985-995.
    [7] 应宏伟, 谢康和, 潘秋元, 等. 软黏土深基坑开挖时间效应的有限元分析[J].计算力学学报, 2000, 17(3): 349-354. (YING Hong-wei, XIE Kang-he, PAN Qiu-yuan, et al. FEM analysis on time-effects of deep excavations in soft clay[J]. Chinese Journal of Computational Mechanics, 2000, 17(3): 349-354. (in Chinese))
    [8] OU C Y, LAI C H. Finite-element analysis of deep excavation in layered sandy and clayey soil deposits[J]. Can. Geotech. J, 1994, 31(2): 204-214.
    [9] 应宏伟, 杨永文, 胡安峰, 等. 软土某深基坑开挖的实测性状和环境效应分析[J]. 土木工程学报, 2011, 44(增刊): 90-93. (YING Hong-wei, YANG Yong-wen,HU An-feng,et al. Analysis on observed performance and environmental effect of a deep excavation in soft clay[J]. China Civil Engineering Journal, 2011, 44(增刊): 90-93. (in Chinese)).
    [10] MOORMAN C. Analysis of wall and ground movements due to deep excavations in soft soil based on a new worldwide database[J]. Soils and Foundation, 2004, 44(1): 87-98.
    [11] OU C Y, HSIEH P G, CHIOU D C. Characteristics of ground surface settlement during excavation[J]. Canadian Geotechnical Journal, 1993, 30(5): 758-767.
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出版历程
  • 收稿日期:  2014-07-27
  • 发布日期:  2014-07-27

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