中国铁道科学2012，Vol.33Issue(2)：1-6,6.DOI:10.3969/j.issn.1001-4632.2012.02.01
CRTS-Ⅰ型板式无砟轨道线路路基不均匀沉降限值研究
Study on the Limited Value for the Uneven Settlement of Subgrade under CRTS- Ⅰ Type Slab Track
摘要
Abstract
A vehicle-slab track-subgrade three-dimensional nonlinear finite element coupling dynamic model was established based on vehicle-track coupling dynamic theory and considering the nonlinearity of the contact state among components of ballastless track and that between ballastless track and subgrade. With the established model, the limited value for the uneven settlement of subgrade under CRTS-I type slab track was studied under the combined action of gravity load, medium and long wave track random irregularity, shortwave track random irregularity, uneven settlement load of subgrade and temperature gradient load of slab. Results show that temperature gradient load of slab has obvious influence on the mechanical characteristics of components of slab track. It is necessary to take temperature gradient load of slab into account to study the limited value for the uneven settlement of subgrade under CRTS-I type slab track. The limited value for the uneven settlement of subgrade under CRTS-I type slab track is controlled by the fatigue failure of concrete foundation plate. When the uneven settlement of subgrade under CRTS-I type slab track is 7 mm, the maximum tensile stress of concrete foundation plate is 1. 674 Mpa, which is the limited value for the fatigue failure stress of concrete foundation plate. So it is suggested that the limited value for the uneven settlement of subgrade under CRTS-I type slab track should be 7 mm/20 m.关键词
板式无砟轨道/路基/不均匀沉降/限值/高速铁路Key words
Slab track/ Subgrade/ Uneven settlement/ Limited value/ High-speed railway分类
交通工程引用本文复制引用
徐庆元,李斌,周智辉..CRTS-Ⅰ型板式无砟轨道线路路基不均匀沉降限值研究[J].中国铁道科学,2012,33(2):1-6,6.基金项目
国家自然科学基金资助项目(51178469,50908232) （51178469,50908232）
