活动断裂带条件下列车-聚氨酯固化道床轨道系统竖向振动分析

来源期刊:中南大学学报(自然科学版)2021年第2期

论文作者:余翠英 孔凡兵 褚卫松 常卫华 林士财 龚凯

文章页码:625 - 635

关键词:铁道工程;聚氨酯固化道床;断裂带;轨道不平顺;竖向振动;动力特性

Key words:railway engineering; polyurethane cured track bed; fault zone; track irregularity; vertical vibration; dynamic characteristics

摘    要:为探讨活动断裂带条件下聚氨酯固化道床的动力特性及环境适应性,明确系统动力响应与断裂位移的对应关系,针对断裂地带工程地质特征,基于有限单元法建立列车-聚氨酯固化道床系统竖向振动分析模型。研究结果表明:断裂所致的基础错动将直接映射到轨面,形成明显的轨道不平顺,断裂处及端部上拱位置形成明显离缝甚至脱空;系统振动响应随断裂位移增大明显增大,列车在冲击区出现明显“冲击—减载—回稳”现象,且随断裂位移的增大愈明显;断裂位移控制应以安全性指标控制为主,舒适性指标为辅为原则,建议断裂位移控制在20 mm以下;日常养护维修应着重关注断缝及其两侧轨道结构的服役状态以减小冲击范围。本研究可为川藏铁路及类似工程建设提供参考。

Abstract: To investigate the dynamic characteristics and environmental adaptability of polyurethane cured track bed under active fault zone conditions, and clarify the corresponding relationship between system dynamic response and fracture displacement, a vibration analysis model of vertical train-polyurethane cured bed track system was established based on the finite element method by considering the engineering geological characteristics of the fault zone. The results show that the foundation misalignment caused by the fault will be directly mapped to the rail surface and will cause obvious track irregularities. Obvious gaps or even vacancies are formed at the position of fracture and the ends of upper arch. The system vibration response increases significantly with the increase of the fracture displacement. Trains have obvious "Shock—load reduction—stabilization" phenomenon in the impact area, and become more and more obvious with the increase of fracture displacement. Control of fracture displacement should be based on safety index mainly, supplemented by comfort index. It is recommended that the fracture displacement should be controlled below 20 mm. The service status of track structure at the fracture position and its sides at daily maintenance should be focused to reduce the impact range. The research will provid a reference for the construction of the Sichuan—Tibet Railway and the similar projects.

有色金属在线官网  |   会议  |   在线投稿  |   购买纸书  |   科技图书馆

中南大学出版社 技术支持 版权声明   电话:0731-88830515 88830516   传真:0731-88710482   Email:administrator@cnnmol.com

互联网出版许可证:(署)网出证(京)字第342号   京ICP备17050991号-6      京公网安备11010802042557号