铁道标准设计Issue(6)：10-13,14,5.DOI:10.13238/j.issn.1004-2954.2014.06.003
土质路基板式无砟轨道基床动力特性研究
Study on Dynamic Characteristics of Soil Subgrade Bed for slab Ballastless Track
摘要
Abstract
Ballastless track technology is widely being used for the development of high-speed railway. When using Winkler model to analyze the ballastless track on soil subgrade, the dynamic stress distribution rule in subgrade and the subgrade reaction coefficient are the two key factors to dominate success or failure of railway route structure design. In order to study the distribution characteristics of dynamic parameters in subgrade bed under the action of cyclic load, a large-scale laboratory dynamic model test was performed based on the example of ballastless track of the Suining-Chongqing high-speed railway. Furthermore, in view of engineering applicability, the distribution of dynamic stress of foundation slab bottom of ballastless track was simplified, and the dynamic stress in subgrade was calculated by combining Odemark theory with elastic theory, with the result that the calculated values were very close to the measured data. Then, on the premise that the dynamic stress had been known, this paper assumed each soil layer of subgrade to be one-dimensional compression model, and determined the reasonable thickness of finite compression layer. Then, this paper explored the method of transforming the multiple soil layer system into the equivalent Winkler foundation model, and the subgrade reaction coefficients with different working conditions were acquired. Finally, by comparison with measured data, it is proved that this calculation method is effective.关键词
路基基床/动力特性/基床反力系数/动力模型试验/无砟轨道Key words
subgrade bed/dynamic characteristics/coefficient of subgrade reaction/dynamic model tests/ballastless track分类
交通工程引用本文复制引用
孔祥辉,张思峰,蒋关鲁,董志泓..土质路基板式无砟轨道基床动力特性研究[J].铁道标准设计,2014,(6):10-13,14,5.基金项目
国家自然科学基金项目(51108252) （51108252）
铁道部科技开发计划(2010G003-F) （2010G003-F）
山东省自然科学基金项目(ZR2010EQ030) （ZR2010EQ030）
