Abstract：Research purposes: When the CRTSⅠdouble － block ballastless track is laid out on long － span continuous bridge，the principle of interaction between bridge and rail is more complicated，and the traditional calculated method，calculated model and design parameters are unavailable． With the finite element method，the longitudinal － transverse －vertical spatial coupled model is established to calculate and analyze the influencing laws of design factors，such as the annual temperature difference between the track bed slab and bed plate，fastening longitudinal resistance，elastic modulus of rubber pad and friction coefficient of isolation layer，and the advices are given on the selection of design parameters of CRTSⅠdouble － block ballastless track CWR on long － span bridge of high － speed railway．
Research conclusions: In the process of design and check，the temperature difference between the track bed slab and bed plate should be selected as different annual temperature difference according to actual situation of different regions．Application of small resistance fastenings on bridge would reduce the maximum additional longitudinal rail force and track structure stress obviously，but the creeping amount of fastening on the beam end of long － span bridge would be big and should be paid attention to． The high － elastic rubber pad should be installed around the positive stop groove． The isolation layer with friction coefficient should be installed between track bed slab and bed plate．
Jiang Jianshe，Luo Xinnan，Peng Renjun． Research on the Equipments for Construction of CRTSⅠ Ballastless Track on Wuhan － Guangzhou Passenger Dedicated Line［J］． Journal of Railway Engineering Socity，2009( 7) : 54 － 56，66．
Yan Shaofa， Ding Lijin， Wang Shangao． Key Construction Technology for CRTS Ⅰ Double － block Ballastless Track in Tunnel ［J］． Journal of Railway Engineering Socity，2009( 11) : 13 － 16．
Liu Bin． Construction Technology and Quality Control for CRTSⅠDouble － block Ballastless Track on Wuhan －Guangzhou Passenger Dedicated Line ［J］． Railway Standard Design，2010( 1) : 58 － 63．
Zhang Feng． The Main Points of Construction Accuracy and Dynamic and Static Fine Tuning of CRTSⅠDouble －block Ballastless Track ［J］． Railway Standard Design，2010( 1) : 69 － 71．
Liu Shihai，Guo Jiangang，Wang Bo． Research of Static and Dynamic Adjustment of CRTS Ⅰ Double － block Ballastless Track ［J］． Railway Standard Design，2010( 1) : 80 － 84．
Li Fangdong． Key Construction Technology for CRTSⅠDouble － block Ballastless Track on Wuhan －Guangzhou Passenger Dedicated Line ［J］． Railway Engineering，2010( 1) : 26 － 29．
Chen Peng，Gao Liang，Feng Yawei，etc． Variety Rules of Additional Longitudinal Force of Continuously Welded Rails on Bridge with Continuous Beam ［J］．Journal of Beijing Jiaotong University，2007 ( 1 ) : 85 －88．
2011, Vol. 28 
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