The Model Experiment Design And Research Of The High Temperatures Stability For Crts Ⅰ Double-block Ballastless Track

Nowadays,despite the fact of the rapid progress of high-speed railway construction in China,some imperfections have emerged in operations and serving processes of the ballastless track.For instance,there are already some system imperfections in CRTS Ⅰ double-block ballastless track,including double-block ballastless sleepers abstinence,interlayer connection failure and the imperfection of slab arch under the high temperature.Among those,the imperfection of slab arch would even exacerbate the problems of track vertical irregularity and lead off seam between slab and supporting bed At present,to ensure high-standard requirements of stability and smoothness in high-speed railway,urgent things to be carried out immediately are to start the experiment on models,and research on longitudinal-connect ballastless track stability theory as well as establish relatively completed the calculation theories and methods on the continuous reinforced concrete structure bending stability of ballastless track.This thesis,aiming at the imperfection of the CRTS Ⅰ double-block ballastless track,by combining the existing longitudinal-connect ballastless track stability theory and data in field investigation,gives a design and implementation on model experiment of CRTS Ⅰ double-block ballastless track high temperature stability.First of all is the field research on system imperfections on CRTS Ⅰ double-block ballastless track,and the basic analyze the causes according to the specific circumstance of slab arch imperfection under the high temperature.Secondly,start the selection of scale of the model experiment,ratio similitude design of model,model structure design of model and the selection of experiment equipments.Then, acquire the critical wavelength when slab arch start losing stability under the related force of the temperature by analyzing slab arch mechanism of the CRTS Ⅰ double-block ballastless track using the first kind of stability theory.Based on the method of the finite element,calculate vertical displacement of knee wall,brace and slab in occasion of temperature loading in model experiment, which would fundamentally support the calculation in selection of following scheme.After that, before the start of the model experiment,do the model slab temperature increasing test,verify the feasibility of method which heat up model of slab by the thermal radiation of the heat steel-plate and affirm the best way of heating up.Compare the vertical temperature displacement of the slab and theoretical result,finalize the parameters in theoretical calculation,verify the applicability of the chosen measuring system.Finally,set up the specific plan for the model experiment for CRTS Ⅰ double-block ballastless track high temperature stability to found the early foundation of the model experiment of double-block ballastless track high temperature stability in the future, and to contribute to reference to the other types of the high temperature stability model experiment of the longitudinal-connect ballastless track.