›› 2006, Vol. 27 ›› Issue (11): 1909-1914.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

FLAC-based numerical analyses of bearing capacity and failure mechanism of strip and circular footings on nonhomogeneous foundations

ZHAO Shao-fei1－3, LUAN Mao-tian1, 2, FAN Qing-lai1, 2, LÜ Ai-zhong3, YUAN Fan-fan4   

  1. 1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China; 2. Institute of Geotehnical Engineering, School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China; 3. School of Civil Engineering, Shandong University of Science and Technology, Qingdao 266510, China; 4. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
  • Received:2005-02-21 Online:2006-11-10 Published:2013-12-04

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Abstract: Using the FLAC algorithm based on Lagrangian explicit finite difference method, numerical analyses are made on ultimate bearing capacity and failure behavior of strip footings and circular footings founded on nonhomogeneous clays foundations in which soil cohesion increases linearly with depth. Numerical results show that: (1) foundation failure area much more centralizes in surface layer and around footing sides as nonhomogeneous factor kB/c0 increases; (2) bearing capacity are estimated very conservatively if foundation nonhomogeneity is ignored even if kB/c0 is low; (3) bearing capacity factor of footing nonlinearly increases with kB/c0 and interface characteristic of footing and soil has less influence on the bearing capacity shape factor of circular footings except for the homogeneous foundation. Compared with numerical results, it is found that the approximate equations of Skempton and Peck et al. obviously overestimate bearing capacity factor Nc0 for nonhomogeneous soils.

Key words: nonhomogeneous foundation, strip footing, circular footing, ultimate bearing capacity, Lagrangian explicit finite difference procedure

CLC Number: 

  • TU 441
  • 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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