STUDY ON SETTING METHOD OF POSITION-LIMITATION RECESS OF CRTSⅢ SLAB TRACK ON SUBGRADE

Recesses are set in the bottom slab of CRTSIII slab track to couple with the bulgy blocks on self-compacting concrete layer so as to transfer forces and restrict displacements. A spatial model for static analysis of CRTSIII slab track on subgrade is established by finite element software, and a vehicle-track coupling dynamic model is established by FOSYS, a dynamic analysis procedure developed by the authors. The statics and dynamics characteristics of a track structure are compared in the cases of two main setting schemes of the recesses. The results show that: 1) the forces and deformations of a track structure in the two cases differ slightly under temperature loads, vehicle loads and foundation settlement, but both are in reasonable range; 2) the lateral stability of a track structure of the double-recess scheme is much better than the single-recess scheme when the friction of the geotextile between self-compacting concrete layer and bottom slab is not great enough; 3) the dynamics indexes of the two schemes all meet the requirements of ‘code for design of high speed railway’ under dynamic loads. The setting method of position-limitation recesses has little influence on the dynamics characteristics of a track structure. Overall, both of the two schemes are feasible. In the consideration of long term performance, the double-recess scheme is better than the other in lateral stability, thusly the double-recess scheme is recommended to apply.