›› 2008, Vol. 29 ›› Issue (6): 1701-1705.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Influences of different directional unloadings upon displacements and internal forces of retaining structure for foundation pit

YIN De-shun1,2, WANG Bao-tian2, ZHANG Wen-hui2   

  1. 1. Department of Engineering Mechanics, Hohai University ,Nanjing, 210098 China; 2. Research Institute of Geotechnical Engineering, Hohai University, Nanjing, 210098 China
  • Received:2007-04-12 Online:2008-06-10 Published:2013-07-15

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Abstract: The excavation of foundation pit involves both horizontal and vertical unloading processes. In order to investigate influence of each directional unloading on displacement and internal pressure of the retaining structure, a foundation pit is analyzed via the FEM simulation of the corresponding modified Duncan-Chang model, under respective unloading of horizontal or vertical pressure. It is shown that the horizontal displacement of retaining structure is largely caused by the horizontal unloading; while the vertical unloading is responsible for the negative internal force. Consequently, this study provides an explanation about the often-observed fact that measured internal pressure in the field is always lower than the one expected in the design.

Key words: unloading, internal force , horizontal displacement；finite element method

CLC Number: 

  • TU 470
  • Please send e-mail to pingzhou3@126.com if you would like to read full paper in English for free. Parts of our published papers have English translations.
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