倾斜荷载作用下桶形基础承载力特性研究  

Studies of bearing capacity of bucket foundation against inclined loading

作　　者：武科[1,2] 栾茂田[1,2] 范庆来[3] 王志云[1,2] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,大连116024 [2]大连理工大学土木水利学院岩土工程研究所,大连116024 [3]鲁东大学土木工程学院,山东烟台265304

出　　处：《岩土力学》2009年第4期1095-1101,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.50579006;No.50179006);高等学校博士学科点专项科研基金资助项目(No.20060141017);教育部跨世纪优秀人才培养计划研究基金资助项目(教技函[1998]2号)。

摘　　要：针对吸力式桶形基础结构,借助大型通用有限元软件ABAQUS平台,建立了均质软黏土地基上倾斜荷载作用的三维弹塑性有限元计算模型。通过系统地计算分析,得到了单个倾斜荷载分量作用下桶形基础的承载力特性及其破坏机制。进一步研究了水平倾斜荷载与竖向倾斜荷载共同作用下的桶形基础承载性能,得到了该倾斜荷载加载方式作用下桶形基础在V-H平面内的破坏包络面,依此建立了倾斜荷载与偏心距e之间的三维破坏包络曲面。计算结果表明,偏心距e对竖向倾斜承载力的影响相对水平倾斜承载力较大;桶形基础承载性能随着偏心距e的增大而减小。A series of studies of suction bucket foundation in normally consolidated clay are carried out to investigate the bearing capacity of bucket foundation under inclined loads. A finite element method for assessing bearing capacity of offshore foundations or structures under eccentric and inclined loads is numerically implemented in the framework of the general-purpose FEM software package ABAQUS. In the method, a number of three-dimensional elastoplastic FEM computations for bearing capacity and failure mechanisms are conducted. The numerical results computed by the proposed method indicate that the effect of bearing capacity against vertical inclined loads is more significant than that against horizontal inclined loads. Moreover, failure envelopes in V-H loading space are reducing with the increase of eccentric distance and further investigations of a simple unique expression of failure envelopes. Finally, the three-dimensional failure envelope is formatted in different V-H corresponding to varied eccentricity. Those results by computed will provide referential resources for design and construction.

关 键 词：桶形基础 倾斜荷载 承载力 有限元方法 

分 类 号：TU442[建筑科学—岩土工程]