桩基承载力包络线基本特性数值模拟研究  

Numerical simulation based study on bearing capacity failure envelope behavior of pile-foundation

作　　者：文松霖[1] 王孝兵[1] 

机构地区：[1]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010

出　　处：《水利水电技术》2011年第12期42-46,共5页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金项目(50978034)

摘　　要：基于有限元与荷载传递相结合方法,利用FLAC3D对倾斜荷载下大直径长桩的承载力破坏包络线的特性进行了研究。结果表明,(1)荷载倾斜角度不同,基桩的破坏机理也不一样。(2)倾斜荷载下基桩破坏模式可分为三种:一是由于桩侧摩阻力和桩端阻力不足而发生的破坏;二是由于桩侧土体抗力或桩身材料强度不足而造成的失稳;三是由前两种破坏机理相互耦合作用而造成的破坏。(3)V-H荷载面中桩基承载力包络线形状近似为椭圆的一部分,且椭圆中心不在坐标原点。(4)在桩的承载力方面不同类型荷载之间是相互影响的;在工程设计中,应引起充分的重视。Based on the FEM-load transfer hybric method, the bearing capacity failure envelope behavior of large-diameter long pile under the inclined load is studied herein with FLAC3D（ Fast Lagrangian Analysis of Continua）. The result shows that： 1. the failure mechanisms of the foundation pile are different for the different load inclining angles ; 2. the failures can be divided into three modes, i. e. the failure caused by the insufficient side and tip resistances of pile; the instability caused by the insufficient lateral earth resistance or material strength of pile ; the failure caused by the coupling effect of both the failure mechanisms mentioned above ; 3. the bearing capacity envelope of pile foundation within the V-H loading surface approximates to a part of ellipse and the center of ellipse is not coincided with the origin of coordinate ; 4. for the bearing capacity of pile, the interaction is there among different modes of load, and then full attention must be paid to during the engineering design concerned.

关 键 词：桩基 大直径长桩 有限元分析 倾斜荷载 荷载面 破坏包络线 

分 类 号：TU473.1[建筑科学—结构工程]