Reduced Elastic Modulus of Cracked Support Layer in Twin-Block Ballastless Track

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.