Analysis Mechanical Characteristics On Termination Cutting Off And Temporary Termination Cutting Off Of High Speed Railway CRTSⅡ Slab Track

China has imported the complete technology of Boegl slab track such as design, manufacturing, construction, maintenance, tooling from Germany. So after engineering practice of Jing-Jin high speed railway and technical summary of ballastless track,innovation of ballastless system, Chinese railway researchers and designers has finished CRTS II ballastless track complete technology that has Chinese feature.The most important feature of CRTS II ballastless track is that the baselayer on the bridge is integrated. In order to translate baselayer force which is generated by temperature and applying the brake to roadbed timely, there is termination cutting off and friction slab behind the abutment. If the style of termination cutting off is overturned T, the whole area of termination cutting off and friction slab should use graded gravel which has cement as roadbed. Chinese railway researchers have designed double pillars termination cutting off which can be used in standard roadbed.This thesis built up vehicle-track-termination cutting off model using non-liner finite element software, and analyses dynamic responses of different style of termination cutting off. After that the thesis analyzes the influence of angular of rails, vehicle speed and the disposal of fastener to the dynamic responses of the system.From the result of the analyses, if there is little termination cutting off behind the termination cutting off, the dynamic responses will be less. The displacement of the overturned T termination is much less than the double pillar termination cutting off. Angular of rails can enhance dynamic response of the system. Normally, the speed of the vehicle is higher; the dynamic response of the system is larger. If we dispose the fastener in reason, the dynamic response of the system will be less.Because in China the bridges of high speed railway are very long, it can not construct the baselayer in one time and it must construct step by step. Each construction step is composed by general area and temporary termination cutting off.This thesis use general finite element method software to build up baselayer-bridge model. Then analyze the influence of the friction coefficient which between the bridge and baselayer, length of the temporary termination cutting off and length of the normal area to the system. From the result we can see friction coefficient between the bridge and baselayer should be 0.2～0.5, the best length of the temporary termination cutting off is about 800m, the length of the normal area can be decided by the condition of the constructors.