石太客运专线板式无碴轨道参数影响分析

研究目的：石太客运专线作为国内唯一一条集高速客运与重载货运于一体的客运专线，将首次大规模铺设板式无碴轨道，而当前国内尚没有形成规范的无碴轨道计算理论，因此需深入研究板式无碴轨道受力规律，以保证设计经济、合理。研究方法：采用有限元理论，建立了板式无碴轨道的梁一板模型，应用大型有限元工具软件ansys对模型进行求解。研究结果：总结了荷载作用位置、扣件刚度、轨道板宽度、CA砂浆弹性模量、地基弹性系数等主要参数对轨道板、CA砂浆和底座的受力影响规律，求得列车竖向荷载作用下轨道板和底座的最不利弯矩。研究结论：对于石太线板式轨道设计，扣件节点动刚度取60kN／mm、轨道板宽度取2．4m、地基弹性系数采用墨。取190MPa／m是合理的。计算列车竖向荷载作用下轨道板和底座的最不利弯矩时，荷载作用位置分别考虑位于板中及板端2种工况；CA砂浆弹性模量考虑离散性，按100MPa和300MPa分别计算。

Parameters Effect Analysis of Slab Ballatless Track for Shijiazhuang-Taiyuan Passenger Special Line

Research purposes: Slab ballastless track will be cosmically paved for the first time in Shijiazhuang-Taiyuan passenger special line which is the only line combining high-speed passenger transport with heavy loads freight in China.There is no canonical calculational theory of ballastless track,so the mechanical rules of slab ballastless track should be studied thoroughly,which can make the design economical and reasonable.Research methods:Using the finite element theory,beam-slab model of slab ballastless track is built and the model calculation is caught by the finite element tool software ANSYS.Research results:The mechanical rules of slab ballastless track affected by some main parameters,such as acting position of loads,stiffness of fastener,breadth of slab,elastic modulus of CA mortar and elastic coefficient of foundation,are concluded and the worst moments of slab and pedestal under vertical load of train are calculated.Research conclusions:The calculational parameters are put forward in this paper as follows: dynamic stiffness of fastener is 60 kN/mm,breadth of slab is 2.4 m,K30=190 MPa is adopted as elastic coefficient of foundation,which are suitable for slab track in Shijiazhang-Taiyuan passenger special line.In order to get the worst moments of slab and pedestal under vertical load of train,acting position of loads and elastic modulus dispersal of CA mortar should be considered,acting position of loads includes the middle of slab and the side of slab,and the elastic modulus dispersal of CA mortar contains 100 MPa and 300 MPa.