斜向上拔螺旋桩基础极限荷载计算  

Calculation of ultimate bearing capacity of screw pile group by inclined pull-out test

作　　者：张亚军[1] 董天文[2] 黄连壮 梁力[1] 

机构地区：[1]东北大学资源与土木工程学院,沈阳110004 [2]辽宁省交通高等专科学校道桥系,沈阳110122 [3]辽宁省电力勘测设计院,沈阳110016

出　　处：《岩土力学》2010年第2期441-448,454,共9页Rock and Soil Mechanics

基　　金：沈阳市科技攻关计划(No.1041023-4-02)

摘　　要：斜向荷载作用下抗拔螺旋桩基础的研究选用螺旋桩为研究对象,引入了随动坐标系,并将桩-土相互作用形成的地基反力以载荷的形式施加于桩体和叶片,解决了大变形材料使用小变形弹性材料叠加原理问题,分析了斜向荷载抗拔螺旋桩基础的破坏模式,建立了斜向荷载作用下抗拔螺旋单桩和群桩基础的极限荷载估算公式,通过与螺旋群桩原型试验的极限荷载判定值的对比,斜向极限荷载估算值约为判定值的93.3%。表明所使用的研究方法,提出的破坏模式和极限荷载计算方法比较符合实际情况,对斜向荷载抗拔螺旋桩基础工程的设计与分析有一定的指导意义。The screw pile body and pitch of screw is chosen as the subject investigated of the pull-out screw pile foundation under inclined load; and the subgrade reaction by the pile-soil interactivity were put on surfaces of pile body and pitch of screw by the formal load; at the same time, the moving coordinates were introduced in the analysis. So the used problem of superposition theorem for large deformation material system, for instance soil-pile, could be transferred the small deformation ＆ elastic mass for screw pile body and pitch of screw. The failure model of pull-out screw pile under inclined load was analyzed; and the calculation of ultimate load for a pile and pile group were given; and calculations of ultimate inclined load of screw pile group was 93.3% to the average determined value from field pull-out tests under inclined load. It is shown that the research technique, the failure model and the calculation formulas are consistent with the practical characteristics of the pull-out screw pile group under inclined load on the whole and these research results can guide the designing and analysis of pull-out screw pile foundation under inclined load.

关 键 词：桩基础 螺旋桩 斜向荷载 破坏模式 极限承载力 

分 类 号：TU473[建筑科学—结构工程]