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| Effect Analysis of CRTSⅠType CA Mortar Degradation on Its Fatigue Life |
| XU Hao1, LIN Hong-song1, YAN Hua1, WANG Ping2 |
| (1. China Railway Eryuan Engineering Group Co. Ltd, Chengdu, Sichuan 610031, China; 2. MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China) |
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Abstract Abstract：Research purposes： Debonding between slab and cement asphalt mortar(CA mortar) layer is a typical damage of China Railway Track System (CRTS) Ⅰtype slab track and the CA mortar degradation will reduce its fatigue life under the train loading. In order to study the effect of CA mortar degradation on its fatigue life, the finite element model of CRTSⅠtype slab track was established in this paper, the stress and fatigue life of CA mortar were researched in different degradation situations on the basis of Miner linear fatigue cumulate damage rule, which could provide reference for the maintenance of slab track. Research conclusions：（1）The stress and fatigue life of CA mortar decrease when the performance degradation of CA mortar layer is 50%, and the fatigue life of CA mortar could meet service life of 60 years.（2）When considering the debonding of CA mortar layer or performance degradation of 50% and debonding of CA mortar layer, the stress of CA mortar increases observably, the fatigue life of CA mortar decreases observably.（3） The fatigue life of CA mortar could not meet the 60 years of service life when the debonding length of CA mortar layer is 1.225 m.（4）The debonding length of CA mortar layer should not be exceed to 1.225 m. The maintenance should be strengthened in the service life of CA mortar, which can prevent the fatigue damage of CA mortar.（5）The research results can provide reference for the maintenance of CA mortar.
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Received: 13 November 2017
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2017, Vol. 34 
