软基上沉入式大圆筒结构的水平承载力分析

大圆筒结构是一种适宜于软土地基上的新型港口水工建筑物,但目前对于软基上大圆筒结构的水平极限承载力尚缺乏合理的计算模式和分析方法.结合长江口深水航道治理二期工程,针对大圆筒结构设计方案提出了一种简便而实用的上限极限分析方法,采用有限元数值分析解验证了所提出计算方法的合理性,进而,据此进行了一系列变动参数比较计算,以此对大量的计算结果进行了系统的分析,所得到的数值计算结果与分析结论为工程设计提供参考依据.

Numerical analysis of lateral load bearing capacity of large cylindrical structures on soft foundations

The applications of large cylindrical structure in coastal and offshore engineering have been rapidly increased recently. However there is no a commonly-acceptable procedure for evaluating lateral loat capacity of this type of structures on soft ground. In this paper, an approximation based on upper-bound limit analysis of plasticity is proposed for assessing the ultimate lateral load bearing capacity of large cylindrical structures. And it is verified by a comparative study with finite element solutions by use of finite element analysis software ABAQUS. For the large cylindrical structure which is to be employed in the second-phase project of the deep-water channel of the Yangtze estuary, a number of parametric computations are conducted. The numerical results computed by the proposed method will be helpful in engineering practices.