Theoretical study of longitudinal connection for rubber floating slab track of subway tunnel
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摘要: 建立了地铁列车-橡胶浮置板轨道-隧道耦合动力学模型, 用MATLAB编制了相应的耦合动力仿真程序, 并用ANSYS软件对耦合动力仿真程序计算结果进行了验证。运用耦合动力仿真程序, 以地铁B型列车以80km·h-1分别运行在地铁隧道3种浮置板长度、5种橡胶刚度的橡胶浮置板线路上为例, 计算了橡胶浮置板纵向连接方式对耦合系统动力特性的影响。计算结果表明: 浮置板纵向铰接对车辆各部件动力特性、最大轮轨力、钢轨动力特性、橡胶垫动力特性、隧道动力特性影响较小, 影响在10%以内。浮置板纵向铰接后, 浮置板振动加速度有较大幅度的降低, 但浮置板最大正弯曲应力有一定幅度的增加。当浮置板较长并且橡胶减振垫刚度较低时, 浮置板纵向铰接后, 2块相邻浮置板连接处扣件最大拉力有较大幅度的降低, 降低幅度可超过80%。浮置板长度为1.25m时, 浮置板轨道不需要纵连铰接; 浮置板长度为5.00m时, 橡胶减振垫刚度小于0.01N·mm-3, 浮置板轨道需要纵连铰接; 浮置板长度为31.25m时, 橡胶减振垫刚度小于0.02N·mm-3, 浮置板轨道需要纵连铰接。Abstract: A coupling dynamics model of subway train, rubber floating slab track and tunnel was established, its corresponding program for coupling dynamic simulation was developed by MATLAB software, and the calculation result of coupling dynamic simulation program was verified by ANSYS software.With the developed coupling dynamic simulation program, a B-type subway train with a speed of 80km·h-1 was taken as an example, when it past through rubber floating slab track on tunnel with 3 kinds of floating slab lengths and 5 kinds of rubber stiffnesses, the influence of longitudinal connection form of rubber floating slab on the dynamic characteristics of coupling system was calculated.Calculation result shows that longitudinally articulated floating slab has little influence on the dynamic characteristics of each vehicle component, the maximum wheel-rail force, the dynamic characteristics of rail, the dynamic characteristics of rubber mat, and the dynamic characteristics of tunnel, and the influence is less than 10%.When floating slab is longitudinally articulated, the vibration acceleration of floating slab decreases significantly, but the maximum positive bending stress of floating slab increases to a certain extent.When the length of floating slab is longer and the stiffness of vibration-reduced rubber mat is lower, after the floating slab is longitudinally articulated, the maximum fastener tensile force near the joint of two neighboring floating slabs decreases significantly, and the decrease amplitude may exceed 80%.When the length of floating slab is 1.25 m, it is not necessary for the floating slab track to be longitudinally articulated, but when the length of floating slab is 5.00mand the stiffness of vibration-reduced rubber mat is less than 0.01N·mm-3, the floating slab track should be longitudinally articulated.When the length of floating slab is 31.25m, the floating slab track should be longitudinally articulated if the stiffness of vibration-reduced rubber mat is less than 0.02N·mm-3.
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Key words:
- subway /
- floating slab track /
- tunnel /
- coupling dynamics /
- longitudinal connection
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图 4 浮置板最大加速度时程曲线
Figure 4. Time-history curve of the maximal acceleration of floating slab
图 5 隧道最大振动加速度时程曲线
Figure 5. Time-history curve of the maximal vibration acceleration of tunnel
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