›› 2009, Vol. 30 ›› Issue (6): 1735-1746.

• Geotechnical Engineering • Previous Articles     Next Articles

Analysis and treatment of dangerous status of a deep foundation pit in soft clay

HUANG Guang-long，ZHANG Feng，WEI Min，FANG Qian   

  1. College of Civil Engineering, Nanjing University of Technology, Nanjing 210009, China
  • Received:2007-10-29 Online:2009-06-10 Published:2011-03-09

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Abstract:

An engineering example that a deep foundation pit is in dangerous status caused by over excavation in soft clay is described. The soil layers mainly including mucky silty clay is typical and representative floodplain of the Yangtze River. During pit excavation, the depth of foundation pit increases because the basement project is adjusted, meanwhile the retaining structure is not reinforced in advance, which does not satisfy the design requirements, so as to lead to dangerous status of the pit. Through comparing the internal force and the displacement of retaining structures at different excavation depth conditions, the reasons why the dangerous situation occurs are analyzed. Based on the deformations of retaining structures and surroundings, the effective treatments according to the foundation pit problems are proposed to ensure the foundation pit safety.

Key words: deep foundation pit, over excavation, internal force, deformation

CLC Number: 

  • TU 473
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