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| Research on the CRTS Ⅱ Slab Ballastless Track Buckling Deformation in the Process of Construction |
| LIU Fu-shan, ZENG Zhi-ping, WU Bin |
| Central South University, Changsha, Hunan 410075, China |
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Abstract Abstract：Research purposes：The slab of CRTS Ⅱ slab ballastless track lies in a state of eccentric compression during the time when the narrow gaps have been cemented and the slabs are not connected, which will easily lead to the buckling deformation for slab under the effect of temperature. A finite element model of the CRTS Ⅱ slab was established by using ANSYS software to study the buckling deformation of slab under temperature load in this paper. The weak link in the deformation process as well as the influences of bond strength of CA layer, gap depth of slab and temperature gradient of slab on the critical temperature rise amplitude of slab were analyzed by the simulation of the buckling deformation under temperature load.
Research conclusions：(1) The CTRS Ⅱ track slab buckling deformation spreads gradually from the first fastener near the end point of slab to the middle of slab with the increasing of temperature. The slab may separate with the CA layer due to the bond failure under certain critical temperature ΔT. (2)The critical temperature increases with the increasing of bonding strength of CA layer. The larger bond strength of CA layer can not only inhibit and delay the buckling deformation, but also reduce the degree of buckling deformation. (3) The critical temperature ΔT increases with the decreasing of the gap area between the slab and CA layer in the construction process. (4) The buckling deformation of slab may be intensified under the effect temperature gradient of slab. (5) The bonding situation between the slab and CA layer can be reflected by the buckling deformation under different temperature. (6) The research results are useful to improve the construction technology of CRTS Ⅱ slab ballastless track.
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