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Volume 36 Issue zk2
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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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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

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  • Received Date: July 27, 2014
  • Published Date: July 27, 2014
    Graphical Abstract
    • 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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    • References (11)
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