竹筋格栅加固高陡沟壑黄土填方路基数值模拟研究  

Numerical Simulation of Loess Filled Subgrade Reinforced with Bamboo Grids in High and Steep Gullies

作　　者：陈国舟 杜子博 田浩东 张景伟[1] CHEN Guo-zhou;DU Zi-bo;TIAN Hao-dong;ZHANG Jing-wei(College of Water Conservancy and Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;Henan Urban Planning and Design Institute Corporation,Zhengzhou 450044,China)

机构地区：[1]郑州大学水利与土木工程学院,郑州市450001 [2]河南省城乡规划设计研究总院股份有限公司,郑州市450044

出　　处：《公路》2024年第1期1-8,共8页Highway

基　　金：国家自然科学基金区域创新发展联合基金重点项目,项目编号U22A20598;河南省重点研发与推广专项,项目编号212102310279;国家自然科学基金项目,项目编号51908513。

摘　　要：竹筋格栅是一种新型加筋材料,其具有的高强、环保等特点使其优于土工格栅等传统加筋材料。通过ABAQUS三维建模计算,对高陡沟壑黄土填方路基填土与原状土交界面竹筋格栅加固效果及其影响因素进行研究。研究结果表明:黄土填方路基填土与原状土交界面最大差异沉降和最大横向位移均位于路基顶部;在填土与原状土交界面采用竹筋格栅加筋后交界面差异沉降较加筋前明显减小,交界面横向位移亦明显减小;相比于中部和底部,在路基上部位置铺设竹筋格栅效果最优,交界面差异沉降减少量最大;竹筋格栅间距存在最优加筋间距,即界面差异沉降控制效果随格栅间距变密而提升,但间距过密时效果提升不明显。在实际工程中可仅在路基中上部位置铺设竹筋格栅,并选择最佳的格栅间距。Bamboo grid is a new type of reinforcement material,which is superior to traditional reinforcement materials such as geogrid due to its characteristics of high strength and environmentfriendliness.The ABAQUS 3D modeling and calculation,the reinforcement effect and its influencing factors are studied regarding the bamboo grids set at the interface between the fill and the undisturbed soil of the filled subgrade in high and steep gullies.The results of ABAQUS simulation show that the maximum differential settlement and the maximum lateral displacement of the interface are both located at the top of the subgrade;after reinforced with bamboo grids at the interface,the differential settlement and the lateral displacement of the interface is significantly reduced compared with that without reinforcement;compared with the middle scheme and the bottom scheme,the scheme of setting bamboo grids in the upper part of the subgrade is the best,in which the reduction of differential settlement at the interface is the largest;there is an optimal reinforcement spacing for the bamboo grids,because the reinforcement effect increases with the spacing becoming dense,but the effect improves not obviously when the spacing is too dense.In the practice of projects,the bamboo grids can only be laid in the upper part of the subgrade,and the optimal spacing for the bamboo grids should be selected.

关 键 词：路基工程 竹筋格栅 黄土填方路基 数值模拟 差异沉降 界面加筋 

分 类 号：U416.1[交通运输工程—道路与铁道工程] U419.4