摘要
为进一步提升我国高速铁路运输水平,开展既有时速250 km高铁提速关键技术研究迫在眉睫,轨道作为直接承受列车荷载的结构,其速度提高后的适应性是影响列车安全平稳运行的重要因素。基于现场调研、有限元分析、数值计算等方法,针对有砟轨道、无砟轨道、轨道设计超高3个方面的适应性进行研究,并提出了时速250 km高铁提速轨道技术条件。主要结论如下:有砟轨道提速后会引起扣件、道床各动力指标增大,从而降低使用性能;无砟轨道提速后会使道床板和底座板纵横向弯矩增大,路基段道床板纵向弯矩增幅最大,为4.7 kN·m/m;考虑到安全富裕量,提速后路桥隧地段道床板和底座板配筋均能满足强度及裂纹宽度要求;提速后超高需进行相应调整,并满足不同速度下曲线半径及缓和曲线的相关要求;提速后应关注道床结构排水、轨道平顺性等,并符合现行规范相关要求。
To further improve the transportation level of China’s high-speed railway,it is urgent to research on the key technology of speed increase for the existing 250 km/h high-speed railway.The track structure directly bears the train load,the adaptability of the track after the train speed increase is an important factor affecting the safe and stable operation of the train.Based on the field investigation,finite element analysis,numerical calculation and other methods,this paper studies the adaptability of ballasted track,ballastless track and designed track superelevation,and the technical conditions for the speed-increase track of 250 km/h high-speed railway are put forward.The main conclusions are as follows:the speed increase of ballasted track lines will cause the increase of dynamic indexes of the fastener and track bed,which will reduce the service performance of structures;the speed increase of ballastless tracks will cause the increase of the longitudinal and transverse bending moments of track slab and concrete base slab,and the longitudinal bending moment of track slab in subgrade section increases the most,which is 4.7 kN·m/m;considering the safety margin,the reinforcement of track slab and concrete base slab in the subgrade,bridge and tunnel sections meets the requirements of strength and crack width;after the speed increases,the track design curve superelevation should be adjusted to meet the requirements of minimum curve radius and transition curve length under different speed levels;after the speed increase,attention should be paid to the drainage of track slab structure,track smoothness,etc.,and the relevant requirements of the current specifications should be satisfied.
作者
梁延科
LIANG Yanke(Railway Line and Station Yard Design Department,China Railway Design Corporation,Tianjin 300308,China)
出处
《铁道标准设计》
北大核心
2022年第9期26-30,共5页
Railway Standard Design
基金
中国国家铁路集团有限公司科技研究计划重大课题(K2019G043)。
关键词
高速铁路
提速线路
适应性
有砟轨道
无砟轨道
曲线超高
high-speed railway
speed-increase railway line
adaptability
ballasted track
ballastless track
curve superelevation
