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Volume 37 Issue 3
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LIAO Shao-ming, WEI Shi-feng, TAN Yong, LIU Jun-xi. Field performance of large-scale deep excavations in Suzhou[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(3): 458-469. DOI: 10.11779/CJGE201503009
Citation: LIAO Shao-ming, WEI Shi-feng, TAN Yong, LIU Jun-xi. Field performance of large-scale deep excavations in Suzhou[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(3): 458-469. DOI: 10.11779/CJGE201503009
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Field performance of large-scale deep excavations in Suzhou

  • 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. Architectural Design and Research Institute of Guangdong Province, Guangzhou 510010, China

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  • Received Date: July 13, 2014
  • Published Date: March 23, 2015
    Graphical Abstract
    • Abstract
  • The performance of large-scale deep excavations in Suzhou, China is comprehensively examined based on a great deal of field data, concerining the excavation of Suzhou Modern Media Plaza (SMMP), 11 rectangular excavations (i.e., aspect ratio of length to width is around 1.01~2.68) constructed by the bottom-up method and supported by auger-cast-in-place piles, and at least 23 long and narrow metro station excavations supported by diaphragm walls in the same area reported in literatures. On the basis of the analysis of monitoring data, some major findings are obtained: (1) the average of the maximum lateral wall deflection, δhm, is 0.08%He for the rectangular excavations and 0.20%He for the metro excavations, where He is the excavation depth; (2) the depth Hm, where δhm occurs, falls between Hm = He-10 and Hm = He + 5 for the rectangular excavations and between Hm = He-7 and Hm = He + 8 for the metro excavations. Hm of the excavation propped by steel-reinforced concrete struts is a little smaller than that propped by steel pipe struts; (3) the maximum ground surface settlement, δvm, is around (0.01%~0.09%) He for the rectangular excavation of SMMP supported by diaphragm walls and around (0.04%~0.27%) He for the metro excavations. The ground settlement zone is about 4.5He behind the retaining walls for the metro stations which is larger than that of the rectangular excavations; (4) the ratio of δvm/δhm is around 0.13~1.07 for the excavation of SMMP and around 0.22~1.65 for the metro excavations; (5) the vertical column movement, δcu, is around (0.07%~0.26%) He for the rectangular excavations and around (0.10%~0.23%) He for the
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