高速公路顺层边坡锚索框架梁和抗滑桩联合支护体系变形特征研究  

Study on Deformation Feature of Combined Support System of Anchor Cable Frame Beam and Anti-slide Pile for Bedding Slope of the Highway

作　　者：郭鹏辉 GUO Penghui(China Railway First Survey and Design Institute Group Co.,Ltd.,Xi'an 710000,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710000

出　　处：《路基工程》2024年第1期60-66,共7页Subgrade Engineering

基　　金：国家自然科学基金-青年项目(42007264)。

摘　　要：以贵州省乌长高速公路某顺层高边坡为例,建立有限元模型,对锚索框架梁-抗滑桩支护体系的变形规律进行研究。结果表明:对各排锚索施加相同的预应力值不合理,存在锚索框架和抗滑桩顺序破坏的风险,应根据各排锚索随桩顶位移的变化规律,设置差异化的预应力值,使锚索框架和抗滑桩两种支护形式同时达到最佳支护效果;靠近桩顶位置,应设置较低的预应力值,远离桩顶位置,应设置较高的预应力值。提出基于变形协调条件下的锚索预应力值计算方法,得到的锚索预应力值与数值模拟计算结果误差在6%以内,满足设计精度要求。Taking a smooth-layer high slope of Wuchang Expressway in Guizhou Province as an example,the deformation law of the anchor cable frame beam-slip-resistant pile support system is investigated by establishing a finite element model.The result shows that it is unreasonable to apply the same prestress value to each row of anchor cables and there is a risk of sequential damage of the anchor cable frame and anti-slip pile.According to the change rule of the displacement of each row of anchor cables with the top of the pile,differentiated prestress value should be set,so that the two support forms of anchor cable frame and anti-slip pile can achieve the best support effect at the same time.When it is closer to the top of the pile,the lower prestress value should be set,and far away from the top of the pile,higher prestress value should be set.The calculation method of prestress value of anchor cable based on deformation coordination condition is presented.The error between the anchor cable prestress value obtained by the proposed method and the numerical simulation results is within 6%,which meets the design accuracy requirements.

关 键 词：锚索框架 抗滑桩 变形协调 预应力 支护效果 

分 类 号：U418.52[交通运输工程—道路与铁道工程]