铁道标准设计Issue(10)：17-20,21,5.
不均匀沉降对无砟轨道路基动力特性的影响
The Inf1uence of Uneven Sett1ement on Dynamic Characteristics of Ba11ast1ess Track Subgrade
摘要
Abstract
In order to analyze the influence of uneven settlement on the dynamic characteristics of ballastless track subgrade, a 3-D dynamic finite element model of CRTSII ballastless slab track subgrade is established, and the vertical dynamic stress, the dynamic displacement and the vibration acceleration of subgrade are calculated and analyzed under the conditions with and without defects. The results show that the dynamic response amplitude and spatial distribution of ballastless track subgrade are obviously changed in case of uneven settlement of subgrade, especially in subgrade 0 ~ 1. 5 m depth within the scope of bearing Layer. The dynamic stress induced by uneven settlement may reach 100kpa, which is more than 3 times of the subgrade without defect. Vertical acceleration also increases more than twice of that without defect. Results also show that the area of uneven settlement develops at a higher rate under repeated train load, which may bring great negative impact on subgrade.关键词
无砟轨道/路基/不均匀沉降/动力响应/分布规律Key words
Ballastless track/Subgrade/Uneven settlement/Dynamic response/Distribution pattern分类
建筑与水利引用本文复制引用
王启云,张家生,孟飞..不均匀沉降对无砟轨道路基动力特性的影响[J].铁道标准设计,2014,(10):17-20,21,5.基金项目
铁道部专项科研基金项目(T2008046)；福建工程学院科研启动基金(GY-Z14003) （T2008046）
