›› 2010, Vol. 31 ›› Issue (12): 3867-3874.

• Geotechnical Engineering • Previous Articles     Next Articles

Assessment methods of chance constrained on bottom stability of foundation pit

LI Feng1, WANG Xiao-rui2, LUO Xiao-hui3, GUO Yuan-cheng1   

  1. 1. School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China; 2. School of Resources & Environment, North China Institute of Water Conservancy and Hydroelectric Electric Power, Zhengzhou 450011, China; 3. Institute of Geotechnical Engineering, College of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China
  • Received:2010-03-03 Online:2010-12-10 Published:2010-12-21

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Abstract:

The limit equilibrium theory is used for analysis of heave resistant stability factor of foundation pit, which becomes dependent upon ‘deterministic’ properties of soil and slide surface. Considering the strength reduction principles and movement unit law which is used to limit equilibrium theory, a ‘deterministic’ analysis model of heave resistant stability factor of foundation which is adapted to different types of slide surfaces is established. Based on the ‘deterministic’ analysis model, reliability analysis of chance constrained programming is established in light of the randomness of the calculating parameters and the constraint condition; there may be no satisfactory strength parameters in the latter one. The calculation and comparison are carried out in view of circular sliding surface and Prandtl’ sliding surface. The influence factor of inserting ratio of deep braced excavation is analyzed for different circle centres, load on excavating pit bottom and bracing load on retaining structure. And also the control of random constraint function for the inserting ratio is studied. As an example, the analysis in light of the theoretical idea is taken out in some engineerings.

Key words: bottom stability of foundation pit, limit equilibrium theory, random variable, chance constrained programming

CLC Number: 

  • TD 853.34
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