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XU Qing-yuan, FAN Hao, MENG Ya-jun, ZHOU Xiao-lin, SHI Cheng-hua. Theoretical study of longitudinal connection for rubber floating slab track of subway tunnel[J]. Journal of Traffic and Transportation Engineering, 2013, 13(4): 37-44. doi: 10.19818/j.cnki.1671-1637.2013.04.006
Citation: XU Qing-yuan, FAN Hao, MENG Ya-jun, ZHOU Xiao-lin, SHI Cheng-hua. Theoretical study of longitudinal connection for rubber floating slab track of subway tunnel[J]. Journal of Traffic and Transportation Engineering, 2013, 13(4): 37-44. doi: 10.19818/j.cnki.1671-1637.2013.04.006
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Theoretical study of longitudinal connection for rubber floating slab track of subway tunnel

doi: 10.19818/j.cnki.1671-1637.2013.04.006

  • School of Civil Engineering, Central South University, Changsha 410075, Hunan, China

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  • Author Bio:

    XU Qing-yuan(1972-), male, associate professor, PhD, +86-731-88836044, xuqingyuan1972@163.com

  • Received Date: 2013-01-27
  • Publish Date: 2013-08-25
    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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