›› 2011, Vol. 32 ›› Issue (S1): 686-0690.

• Numerical Analysis • Previous Articles     Next Articles

Three dimensional effect on stability of suction caisson under combined loading

FAN Qing-lai1, 2, LI Pu-sheng3, NI Hong-ge1, LUAN Mao-tian2   

  1. 1. Key Laboratory of Geotechnical Engineering, Ludong University, Yantai, Shandong 264025, China; 2. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China 3. Weifang Highway Administration, Weifang, Shandong 261206, China
  • Received:2010-12-14 Online:2011-05-15 Published:2011-05-16

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Abstract: Combined with swipe loading method and fixed displacement ratio method, the bearing capacity of suction caisson foundations subjected to horizontal and moment combined loading is explored through three dimensional finite element numerical studies. The effect of embedment to diameter ratio and soil strength nonhomogeneity on the H-M failure envelope of caisson foundations is investigated; and the soil deformation mechanism under various combinations of load components is shown. Through comparison with results under plane strain assumption, it is shown that the shape of failure envelopes of caisson foundations considering three dimensional effect varies from that under plane strain assumption; therefore to evaluate the stability of caisson foundation should account for the three dimensional effect. For nonhomogeneous soil, the failure envelope of caisson foundations with shallower embedment is negatively oblique. The equation of failure envelope available overestimates significantly the bearing capacity of caisson under this condition subjected to positive lateral and moment combined loading, and leads design of caisson foundation to unsafe side.

Key words: foundation, failure envelope, combined loading, nonhomogeneity, failure mechanism

CLC Number: 

  • U 443.13+2
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