中国铁道科学2025，Vol.46Issue(2)：18-28,11.DOI:10.3969/j.issn.1001-4632.2025.02.02
预应力水平和加固模式对铁路路基变形特性的影响
The Influences of Prestress Level and Reinforcement Mode on the Deformation Characteristics of Railway Subgrade
摘要
Abstract
To investigate the performance of reinforced prestressed railway subgrades,this study adopts subgrade deformation as an evaluation index and establishes a three-dimensional finite element model based on model tests.The effects of prestress levels and reinforcement modes on subgrade deformation are analyzed,and countermeasures for subgrade disease prevention and control are proposed.The results indicate that when a prestressed structure is applied to reinforce the subgrade,the prestress can be converted into additional confining pressure to constrain subgrade deformation,thereby improving its service performance.The settlement of the reinforced prestressed subgrade is lower than that of the unreinforced subgrade.At a prestress level of 50 kPa,the settlement attenuation rate at the track center is 8.64%,which increases to 17.44%when the prestress is raised to 100 kPa.The settlement reduction effect of the prestressed structure diffuses from the reinforced zone to the unreinforced zone.At a prestress of 50 kPa,the settlement attenuation rate at the end of unreinforced zone is 6.76%,which increases to 13.92%when the prestress is increased to 100 kPa.In the single-row reinforcement mode,the third and fourth rows exhibit better reinforcement effects compared to the other rows,and the reinforcement zone is significantly influenced by the location of the prestressed structure.Prestressed structures should be placed on the slope surface in problematic areas and subjected to appropriate prestress levels to address subgrade diseases and enhance reinforcement.关键词
铁路路基/预应力结构/沉降衰减率/加固模式/三维有限元模型Key words
Railway subgrade/Prestressed structure/Settlement attenuation rate/Reinforced mode/3D finite element model分类
交通工程引用本文复制引用
张期树,董俊利,徐方,冷伍明,吴爽爽,王文兵..预应力水平和加固模式对铁路路基变形特性的影响[J].中国铁道科学,2025,46(2):18-28,11.基金项目
湖南省自然科学基金资助项目(2023JJ41054,2024JJ8346) （2023JJ41054,2024JJ8346）
