高天隧道水害所致双块式无砟轨道受力特性分析

Study on mechanical characteristics of double block ballastless track in Gaotian tunnel due to water disaster

以贵广高铁高天隧道水害所致CRTSⅠ型双块式无砟轨道道床板上拱为背景,利用ANSYS软件建立隧道内CRTSⅠ型双块式无砟轨道结构有限元模型,考虑详细的轨道结构参数,基于实际上拱变形情况,针对道床板上拱以及道床板上拱和列车荷载耦合作用下的轨道结构受力状态进行分析,研究结果表明:道床板混凝土最大纵向拉、压应力为1.14 MPa和1.70MPa,均小于C40轴心混凝土抗拉、压强度设计值;道床板钢筋最大压、拉应力分别为6.07 MPa和5.99 MPa,远小于HRB335钢筋屈服强度;正常运营条件下双块式无砟轨道结构强度满足要求。研究成果为指导高天隧道恢复正常行车具有参考价值。

The upwarp of bed slab of CRTSⅠdouble block ballastless track due to water disaster in Gaotian tunnel of Guiyang-Guangzhou high speed railway was taken as the background,the finite element model of CRTSⅠdouble block ballastless track structure in tunnel was established by using ANSYS software,the detailed track structural parameters were considered.The stress state of the track structure under the action of the upwarp of the bed slab as well as the coupling action of the upwarp of the bed slab and the train load was analyzed based on the actual deformation of upwarp.The results show:The maximum longitudinal tensile and compressive stresses of concrete for ballast slab are 1.14 MPa and 1.70 MPa,respectively,which are less than the design values of tensile and compressive strength of C40 concrete;The maximum tensile stress and the tensile stress of steel are 6.07 MPa and 5.99 MPa,respectively,which are much smaller than the yield strength of HRB335 steel bars;Under the normal operation condition,the strength of double block ballastless track meets the requirements.The research results have reference value for guiding the tunnel to resume normal traffic.