Reduced Elastic Modulus of Cracked Support Layer in Twin-Block Ballastless Track
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摘要: 用有限元法,在双块式无碴轨道支承层开裂的情况下,针对不同的裂缝间距、支承层厚度和弹性模量,分析了道床板与支承层形成的结合式双层结构抗弯刚度的变化规律,得到了开裂支承层的折减弹性模量.研究表明,支承层材料的弹性模量越高、厚度越大、裂缝间距越小,支承层开裂后弹性模量的折减率越大,设计中应根据相关结构参数和可能的裂缝间距合理确定支承层的折减弹性模量.Abstract: With the finite element method,the bending stiffness of twin-block ballastless track with double combined slabs composed of a track slab and a support layer was investigated through changing the elastic modulus and thickness of the support layer and the interval between cracks,and the reduced elastic modulus of the cracked support layer was obtained.The research shows that small reduced elastic modulus of the cracked support layer will be result in under a great elastic modulus or large thickness of the support layer or a little interval between cracks.It is suggested that the reduced elastic modulus of the support layer should be determined based on the related parameters and possible crack intervals.
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