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| Detection and identification of mortar void in the ballastless track of high-speed railway based on transient impact characteristics |
| TIAN Xiushu1,2，DU Yanliang3,ZHAO Weigang3 |
1.School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China;
2.School of Material Science and Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;
3.Institute of Structure Health Monitoring and Control, Shijiazhuang Tiedao University, Shijiazhuang 050043, China |
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Abstract Based on the transient shock response characteristics, the detection and identification of mortar void in the ballastless track of high-speed railway were studied.The CRTSⅡ ballastless track finite element model was built by LS-DYNA software.The numerical simulations of different sizes of mortar void were carried out.The characteristics of the time-history curve, spectral curve and admittance variation of the simulation results were analyzed.The identification parameters of mortar layer defects based on the transient response characteristics were proposed.The slab impulse response method was used to test the high-speed railway entity models with different sizes of mortar void.It is shown that, when the mortar layer contains voids, the amplitude of the velocity time-history curve increases, the peak value of the low-frequency spectrum increases, the mean value of the admittance increases, and the admittance spectrum exhibits multi-peak characteristics.When the defect length is larger than 0.4 m，the disease of mortar layer can be identified based on the transient impact response characteristics.
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Received: 13 December 2018
Published: 15 September 2019
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