摘要
土工格栅作为一种新型的加筋材料,在柔性加筋挡土墙中得到了广泛的应用。但理论研究滞后于行业经验,地震作用下土工格栅的变形破坏机理有待进一步研究。利用FLAC3D有限差分方法,考察了顶板水平位移和沉降的响应,不同层数下配筋材料的内力分布,配筋模量,峰值高度甚至不同地震配筋荷载下配筋材料的内力分布。结果表明:几何配筋能显著减小挡土墙水平位移和坡顶沉降、增强效果随着层数、模量和高度的增加而改善,但存在“饱和状态”,配筋模量和高度对坡顶残余变形过程有控制作用,靠近板端钢筋的受力沿高度减小,每个钢筋的最大受力点沿高度呈弯钩形,挡土墙对地震加速度的放大效应沿墙高增大,上下墙动力响应相似。研究结果可为挡土墙的加固设计提供参考。
As a new type of reinforced material,geogrids have been widely used in flexible reinforced retaining walls.However,the theoretical research lags behind the industry experience,and the deformation and failure mechanism of geoggrid under earthquake action needs to be further studied.By using FLAC3D finite difference method,the response of roof horizontal displacement and settlement,the internal force distribution of reinforcement materials under different layers,reinforcement modulus,peak height and even the internal force distribution of reinforcement materials under different seismic reinforcement loads are investigated.The results show that:The geometric reinforcement can significantly reduce the horizontal displacement of the retaining wall and the settlement of the slope top,and the reinforcement effect is improved with the increase of the number of layers,modulus and height,but there is a“saturation state”,and the reinforcement modulus and height have a control effect on the residual deformation process of the slope top.The stress of the steel bars near the plate end decreases along the height,and the maximum stress point of each steel bar is bent and hooked along the height.The amplifying effect of retaining wall on seismic acceleration increases along wall height,and the dynamic response of the upper and lower walls is similar.The research results can provide reference for the reinforcement design of retaining wall.
作者
王帅
于竞宇
陈仁义
WANG Shuai;YU Jingyu;CHEN Renyi(Hefei University of Technology,Hefei 230009,China)
出处
《建筑结构》
北大核心
2023年第S02期2685-2689,共5页
Building Structure
关键词
土工格栅
挡土墙
地震作用
数值模拟
动力响应
geocell
retaining wall
seismic action
numerical simulation
dynamic response
