铁道标准设计2018，Vol.62Issue(4)：30-34,5.DOI:10.13238/j.issn.1004-2954.201705090003
动荷载与水耦合作用下无砟轨道混凝土层间裂纹扩展研究
Experimental Research on Crack Propagation between ballastless track Layers of Concrete Subject to Dynamic Load and Water Coupling
摘要
Abstract
With the large-scale application of high-speed railway, the water-induced damages of ballastless track under the coupling of train load and water have attracted much attention. In order to study the crack propagation mechanisms of the ballastless track under the coupling of train load and water,the finite element software is used to analyze the crack propagation in the ballastless track, and crack propagation tests are carried out under the coupling action of dynamic load and water. The results show that the fatigue life of the crack tip has a quadratic relationship with the train speed, and with the increase of the axle load, the fatigue life is significantly reduced; shear stress at the crack tip tends to increase with crack depth increase by high power. The results also show that the initial crack tends to grow in curve and part of the crack is crushed; concrete cracks along the interface between the layers expand in polygonal-shape,and may produce crack bifurcate,leading to crack face off-falling.关键词
无砟轨道/裂纹扩展/列车荷载/动水压力Key words
Ballastless track/Crack propagation/Train load/Hydrodynamic pressure分类
交通工程引用本文复制引用
赵春光,杨荣山,吴梦瑶,杜金鑫,曹世豪..动荷载与水耦合作用下无砟轨道混凝土层间裂纹扩展研究[J].铁道标准设计,2018,62(4):30-34,5.基金项目
国家自然科学基金重点项目(U1434208) （U1434208）
国家自然科学基金(51278431) （51278431）
四川省科技研究计划项目(2016GZ0333) （2016GZ0333）
