饱和砂土地基中吸力式桶形基础水平承载力研究  

Research on horizontal ultimate bearing capacity of suction bucket foundation in saturated sand ground

作　　者：金书成[1] 张永涛[1] 杨炎华[1] 黎冰[2] 

机构地区：[1]中交第二航务工程局有限公司技术中心,武汉430040 [2]东南大学土木工程学院,南京210096

出　　处：《岩土力学》2013年第S1期221-227,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金资助(No.50909020)

摘　　要：吸力式桶形基础不仅承受着上部结构及自身所引起的竖向荷载,还受到波浪、海流、海风等引起的水平荷载作用,在高纬度海域冬季还可能受到海冰的长时间挤压作用。利用三维有限元模型,研究饱和排水砂土条件下吸力式桶形基础的水平极限承载力和失稳模式,分析缓慢施加水平荷载时吸力式桶形基础失稳破坏机制,探讨不同长径比的桶形基础承载性能,研究桶体内外壁土压力分布情况和转动轴位置,并根据极限平衡解法,推导出饱和砂土地基桶形基础水平极限承载力计算公式。研究结果可为砂土地基条件下的吸力式桶形基础的设计提供参考。During working process,suction bucket foundation is not only subjected to the action of vertical load induced by the weights of fan and equipment,but also imposed by lateral loads caused by wind,wave,and current.In the case of high-latitude waters,the suction bucket foundation structures may also suffered by long-term ice pressure.To this end,by using three-dimensional finite element model,this paper researches on the horizontal ultimate bearing capacity and instability mode of suction bucket foundation under the saturated drainage sand conditions,analyzes the suction bucket foundation failure mechanism when horizontal loading slowly,discusses the bucket foundation bearing performance under different length-diameter ratios;and the earth pressure distribution and the rotation axis position of bucket inner and outer are studied.Furthermore,based on the limit equilibrium method,a formula of ultimate horizontal bearing capacity for the suction bucket under saturated drainage sand conditions is deduced.The study results can provide the reference and basis for the design of suction bucket foundation in sand ground.

关 键 词：吸力式桶形基础 饱和砂土地基 水平极限承载力 失稳模式 极限平衡解法 

分 类 号：TU441.4[建筑科学—岩土工程]