›› 2010, Vol. 31 ›› Issue (8): 2648-2654.

• Numerical Analysis • Previous Articles     Next Articles

Stability analysis of large cylindrical structure for strengthening soft foundation under wave load

XIAO Zhong1, WANG Yuan-zhan1, JI Chun-ning1, HUANG Tai-kun2, SHAN Xu3   

  1. 1. Tianjin Key Laboratory of Harbor & Ocean Engineering, Tianjin University, Tianjin 300072, China; 2. China Communications First Design Institute of Navigation Engineering, Tianjin 300222, China; 3. The Third Railway Survey and Design Institute, Tianjin 300142, China
  • Received:2008-11-07 Online:2010-08-10 Published:2010-08-30

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Abstract:

A quasi static finite element method for stability analysis of the large cylindrical structure considering the cyclic weakening effect of soft foundation under wave load was developed by combining the concept of cyclic shear strength with D-P yield criterion. Then the proposed method was numerically implemented in the framework of the general-purpose FEM software ABAQUS. According to a project, the stability of the large cylindrical structure was analyzed. The results show that the stability safety factor of the large cylindrical structure decreased obviously when strength weakening of soft ground was considered while increased remarkably when the soft clay was reinforced by driving drainage plate. And the stability safety factor of the large cylindrical structure increased obviously with the increment of reinforced depth for the same embedded depth of the large cylinder. Weakening degree of the stability safety factor of the large cylindrical structure is 30% when strength weakening of soft ground is considered; so it is suggested that the strength weakening of soft ground should be considered in practical design. Besides, reinforcement of soft soil by driving drainage plate is an effective way to increase the stability safety factor of the large cylindrical structure when the soft ground can't satisfy the bearing requirement of the structure.

Key words: large cylindrical structure, cyclic shear strength, drainage plate, stability, finite element method

CLC Number: 

  • TV 223.2+9
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