Study Of The Effect Of Cement Asphalt Mortar Disease On Mechanical Properties Of CRTS Ⅱ Slab Ballastless Track

CRTS Ⅱ slab ballastless track is one kind of ballastless track structures of which China has got its completely independent intellectual property rights.It can meet the requirements on the performance of high-speed railway track well with its high reliability, high stability and high track regularity.As an important component part of CRTS Ⅱ slab ballastless track structure,the performance of cement asphalt mortar elastic cushion directly affects the regularity and durability of the track structure,comfort and safety of high-speed train running and costs of operation and maintenance. Partly exposed to the natural environment after the track’s completion,cement asphalt mortar elastic cushion has shown signs of different types of deterioration under the action of moving train loads coupled with environmental factors, bringing harming effect to high-speed operation on lines.According to the actual engineering and based on the finite element method and ANSYS contact theory,the three dimension mechanics model of CRTS Ⅱ slab ballastless track structure on subgrade was built with ANSYS software,of which the bottom of the track slab is separated from cement asphalt mortar elastic cushion. Analysis of the influence of stress and deformation characteristics of CRTS Ⅱ slab ballastless track structure caused by different temperature gradients,train load and the coupling action between them under different working conditions was carried out,including no slab,one slab, and multiple slabs separated from the cement asphalt mortar elastic cushion.The results shew that,temperature gradients on track slab is one of the main reasons which caused the gap appearing between the bottom of slab track and CA mortar elastic cushion.And the gap main cause the deterioration of vibration of track slab,accelerating the deterioration of the cement asphalt mortar elastic cushion. The paper therefore suggests that measures should be adopted to restrain the gap appearing and researches of repairing technology of the gap be carried out to restrain the vibration of track slab,decelerating the deterioration of the cement asphalt mortar elastic cushion.