钻孔变截面灌注桩的荷载传递特性  

Load transfer performance of variable-section bored pile

作　　者：杨有莲[1] 朱俊高[1] 

机构地区：[1]河海大学岩土工程研究所,江苏南京210098

出　　处：《水利水电科技进展》2008年第3期37-39,75,共4页Advances in Science and Technology of Water Resources

摘　　要：以某工程钻孔变截面灌注试桩为例,采用三维有限元计算程序,研究了相同土质条件下变截面桩和等截面桩在竖向桩顶加载方式下荷载传递机理的异同。引入相对摩阻力Rτ,进一步分析了桩型对桩侧摩阻力发挥程度的影响:Rτ=1.0,表明桩侧摩阻力充分发挥;Rτ>1.0,桩侧摩阻力表现为强化效应;Rτ<1.0,则桩侧摩阻力表现为软化效应。With a variable-section diameter bored pile as an example, numerical simulation are performed with 3-D FEM to study the load transfer performance of variable-section and uniform-section vertical loaded bored pries under identical geological conditions. By introduction of relative friction, Rτ,the effects of pile-type on the exertion degree of side friction are analyzed： if Rτ = 1.0, it indicates that the skin friction is being sufficiently developed; if Rτ 〉 1.0,it indicates consolidation phenomena; if Rτ 〈 1.0, it indicates softening phenomena.

关 键 词：变截面桩 荷载传递 有限单元法 相对摩阻力 钻孔灌注桩 

分 类 号：TU473.11[建筑科学—结构工程]