不同桩锚支护结构受力性能及影响因素  

Mechanical Behavior and Influencing Factors of Different Pile-anchor Supporting Structures

作　　者：黄华[1] 曾志成[1] 张峰[1] 刘伯权[1] 

机构地区：[1]长安大学建筑工程学院,陕西西安710061

出　　处：《公路交通科技》2015年第12期58-66,共9页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(41202190;51308065);中国博士后科学基金项目(2012M511956;2014T70896);中央高校基本科研业务费专项资金项目(2014G2280014);博士学科点专项科研基金项目(20130205130001)

摘　　要：采用ABAQUS软件,建立桩锚整体式支护结构和桩锚分离式支护结构有限元模型,分析二者受力性能差异,研究桩径、嵌固深度、冠梁尺寸、锚杆数量以及预应力等对其受力性能的影响。结果表明:两类支护结构位移由两端向中间减小,弯矩和剪力则由两端向中间增大,中间部分受力和变形保持一致;设计时应将端部两根抗滑桩的弯矩和剪力分别乘以1.35和1.2的承载力调整系数;桩锚整体式支护结构的最大位移比分离式结构小20%以上,最大弯矩小3%以上,最大剪力小6%以上;增大抗滑桩桩径,两类支护结构的位移和弯矩均减小;增大抗滑桩嵌固深度,两类支护结构的位移减小,但弯矩增大;冠梁尺寸增大可提高支护结构整体刚度和抗变形能力,但作用有限;增加锚杆数量、施加预应力均可显著减小抗滑桩的位移和弯矩,并改变位移和弯矩沿桩身的分布形态;以上参数变化对整体式支护结构的影响要远小于分离式支护结构。The finite element models of integral pile-anchor supporting structure and separate pile-anchor supporting structure are built by using ABAQUS software,and their difference of mechanical performance is analyzed. The influences of pile＇s diameter,nesting depth of pile,size of top-beam,amount of anchor bolts and their prestresses on the supporting structures are analyzed. The result shows that（ 1） the displacements of the 2 kinds of supporting structure diminish from ends to middle part,but the moments and shear forces increase from ends to middle part,and the loads and displacements of middle part remain unchanged;（ 2）the moments and shear forces of 2 anti-slide piles in the end of the supporting structures should separately be multiplied by adjustment coefficients of load-bearing capacity,1. 35 and 1. 2,when they are designed;（ 3）the largest displacement of integral pile-anchor supporting structure is smaller 20% or more than those of separate structure,the largest moment smaller 3% or more,and the largest shear force smaller 6% or more;（ 4） enlarging the anti-slide pile＇s diameter,the displacements and moments of the 2 kinds of structure would diminish;（ 5） increasing the nesting depths of piles,their displacements would diminish,but their moments may increase;（ 6） enlarging size of top-beam,integral stiffnesses and anti-deforming capability of the 2 kinds of the supporting structure would be improved,but the function is limited;（ 7） increasing the number of anchor bolts or prestressing the anchor bolts,the displacements and moments would obviously decrease,andalso change their distributional patterns. The influence of the changes of the above factors on integral pileanchor supporting structure is much smaller than on the separate pile-anchor supporting structure.

关 键 词：道路工程 桩锚支护结构 数值分析 受力性能 承载力调整系数 

分 类 号：U417.1[交通运输工程—道路与铁道工程]