软黏土中桶形基础侧向极限承载力计算的简化方法  

A Simplified Method of Calculating Ultimate Lateral Bearing Capacity of Bucket Foundation Embedded in Soft Clay

作　　者：王乐芹[1] 王晖[1] 余建星[1] 周锡[1] 

机构地区：[1]天津大学建筑工程学院,天津300072

出　　处：《天津大学学报》2008年第5期529-535,共7页Journal of Tianjin University(Science and Technology)

基　　金：国家自然科学基金资助项目(59909005);博士点基金资助项目(20020056030)

摘　　要：基于塑性极限分析理论的上限法极限分析模型,结合最优化方法可以求得桶形基础侧向极限承载力,并对结构相对埋深对承载机理及受力机制的影响进行了研究.根据其相对埋深,将桶形基础结构划分为3种受力模式,即相对埋深β小于0.52时的浅插式、相对埋深β大于1.2时的深插式与介于两者之间的过渡模式.针对上限法极限分析的繁琐与复杂,基于桶形基础不同埋深时的受力机制,探讨了桶形基础侧向极限承载力计算的一种简化方法,并提出了对荷载作用高度的修正,为结构整体稳定性分析提供了一种实用方法.通过大比尺物模试验验证及工程实例的计算与分析比较,进一步证明了该方法的可行性和有效性.The ultimate lateral bearing capacity of bucket foundation was calculated through limit analysis model based on the upper-bound theorem. The effect of embedment-diameter ratio on bearing mechanism was investigated. Bucket foundation was classified into three bearing modes, namely the shallowly embedded bucket foundation when embedment-diameter ratio flis less than 0.52, the deeply embedded type when flis larger than 1.2, and the transitional mode between the former two cases. To avoid the complexity of the upper-bound method, a simplified method was proposed to calculate the ultimate lateral bearing capacity of bucket foundation based on bearing mechanism analysis. Modification to the nonzero loading height was given. It was proved from a physical model test and a practical engineering application that the proposed method was feasible and effective in supplying a valid theoretical solution for structure＇s global stability analysis in design.

关 键 词：桶形基础 侧向极限承载力 上限法极限分析 受力机制 近海工程 

分 类 号：TU2[建筑科学—建筑设计及理论]