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| Analysis of Influence Factors on CRTSⅠDouble － block Ballastless Track CWR on Long － span Bridge of High － speed Railway |
| QU Cun，GAO Liang，QIAO Shen － lu，CAI Xiao － pei |
| Beijing Jiaotong University，Beijing 100044，China |
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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．
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Received: 15 January 2011
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［1］ 蒋建设，罗新南，彭仁军． 武广客运专线CRTSⅠ型双块式无砟轨道施工设备配套研究［J］． 铁道工程学报，2009( 7) : 54 － 56．
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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．
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Chen Zheng． Stability Control Technology for Track Bed Slab Track Panel of CRTS Ⅰ Double － block Ballastless Track［J］． Railway Engineering，2010( 1) : 30 －31．
［10］ 姜强． 桥上CRTSⅠ型双块式无砟轨道简易工装法施工技术［J］． 铁道建筑技术，2010( 1) : 67 － 70．
Jiang Qiang． Construction Technology for Simple Tooling Method of CRTSⅠDouble － block Ballastless Track on Bridge ［J ］． Railway Construction Technology，2010( 1) : 67 － 70．
［11］ 陈鹏，高亮，冯雅薇，等． 连续梁桥上无缝线路纵向附加力的变化规律［J］． 北京交通大学学报，2007( 1) : 85 － 88．
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．
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2011, Vol. 28 
