Improved performance of the subgrade bed under the slab track of high-speed railway using polyurethane adhesive

2019 ◽  
Vol 208 ◽  
pp. 710-722 ◽  
Author(s):  
Jun-Jie Huang ◽  
Qian Su ◽  
Yung-Ming Cheng ◽  
Bao Liu ◽  
Ting Liu
Keyword(s):  
High Speed ◽  
Polyurethane Adhesive ◽  
High Speed Railway ◽  
Slab Track ◽  
Improved Performance

Design and Construction Technologies

2010 ◽  
Author(s):  
Cailan Wu ◽  
Weixiao Cui ◽  
Chengzhi Zhang ◽  
Huaijian Li ◽  
Hongliang Yan
Keyword(s):  
High Speed ◽  
Actual Situation ◽  
Technical Standard ◽  
High Speed Railway ◽  
Deformation Control ◽  
Slab Track ◽  
Railway Construction ◽  
Scheme Optimization ◽  
Key Technologies ◽  
Design And Construction

Combining with the actual situation of China’s railway construction, this paper introduces the key technologies of design and construction of high-speed railway, such as the scheme optimization of subgrade, bridge and tunnel, technical standard, deformation control, advance geology forecast and settlement observation, etc. It also discusses the design and construction problems on the slab layout and interface of CRTS II slab track on bridge section, switch area, subgrade area and the transition with different track structures.

Influence of the Bridge Pier Displacement on the Slab Track Deformation of the High Speed Railway

CICTP 2017 ◽  
2018 ◽  
Author(s):  
Jia-Wei Zhang ◽  
Bing-Long Wang ◽  
Yao Shan ◽  
De Zhang ◽  
Xue-Quan Jiang
Keyword(s):  
High Speed ◽  
Bridge Pier ◽  
High Speed Railway ◽  
Slab Track ◽  
Track Deformation

Natural Vibration Analysis of High-Speed Railway Slab Tracks under Rail Longitudinal Force

2013 ◽  
Vol 706-708 ◽  
pp. 1443-1449 ◽  
Author(s):  
Yi Shi Guo ◽  
Zu Jun Yu ◽  
Hong Mei Shi
Keyword(s):  
High Speed ◽  
Natural Vibration ◽  
Longitudinal Force ◽  
Frequency Equation ◽  
Railway Track ◽  
High Speed Railway ◽  
Slab Track ◽  
Specific Effects ◽  
Coupling Dynamics ◽  
Dynamics Problems

The slab track is the main structure of the high-speed railway track, the Inherent dynamic characteristics of which is of great significance to the research on the Vehicle-Track Coupling Dynamics. The assumptions of the modal function describing the natural vibration of the track is a necessary theoretical basis in analytic and numerical calculations for dynamics problems, which is more in accordance with the real situation, the more likely characteristic estimation are to be accurate. In this paper, with the method of combine matrix, the system characteristic equation of slab-track model is deduced, and the exact analytic formulas of frequency equation and modal function are obtained. Meanwhile the specific effects of the Rail longitudinal force on the vibration performance of the tracks are analyzed through instances. The results show that this approach is an effective analytic method, the solution of which is accurate. And the track parameters can be flexibly initialized, which is especially applicable for the condition of track parameters varying and longitudinal strain with distribution.

Research and Progress on CA Mortar Emulsifying Asphalt of Ballast-Less Slab Track

2011 ◽  
Vol 239-242 ◽  
pp. 2399-2402 ◽  
Author(s):  
Ming Chao Qi ◽  
Xiao Xuan Li ◽  
Zhong Qi Jia
Keyword(s):  
Primary Structure ◽  
High Speed ◽  
Track Structure ◽  
Structure Form ◽  
High Speed Railway ◽  
Slab Track ◽  
Ca Mortar

Ballast-less slab track is the primary structure form of the modern high-speed railway, and cements phalt mortar is the most important component of flexible adjusting layer of slab track structure. This article introduces simply development and application of ballast-less track，then detailed explain the production and research of cements phalt mortar special asphalt lotion .

scholarly journals Design theories and maintenance technologies of slab tracks for high-speed railways in China: a review

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
Juanjuan Ren ◽  
Shijie Deng ◽  
Kaiyao Zhang ◽  
Wei Du ◽  
Qinghong Wu
Keyword(s):  
High Speed ◽  
Field Tests ◽  
Research Trend ◽  
Future Research ◽  
Stable Operation ◽  
High Speed Railway ◽  
Slab Track ◽  
Design Theories ◽  
Future Direction

Abstract The durability and reliability of slab track structures are essential for the long-term safety and stable operation of high-speed railways. In order to provide a solid theoretical basis and technical reference for the advancement of high-speed railway quality, this paper comprehensively discusses design theories of slab track structures, service performance evolution and maintenance technologies, and reviews the innovation happening in the industry. On top of that, the damage evolution, fatigue features and durability of slab tracks, which are highly relevant to serviceability, are summarized, and the future research trend of slab track service behaviours is pointed out. In addition, this paper summarizes the rules of establishing standards for damage maintenance, typical solutions for repairing damage and methods of evaluating the maintenance outcomes that combine field tests and numerical simulations. It also envisions a future direction where advanced testing technologies would assist the evaluation of maintenance effects.

scholarly journals Fatigue Performance of the CA Mortar Used in CRTS I Ballastless Slab Track under Simulated Servicing Condition

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2259 ◽  
Author(s):  
Yuchuan Shan ◽  
Shuguang Zheng ◽  
Xuefeng Zhang ◽  
Wei Luo ◽  
Jingda Mao ◽  
...  
Keyword(s):  
Fatigue Test ◽  
High Frequency ◽  
High Speed ◽  
Comfort Level ◽  
Polymer Emulsion ◽  
High Speed Railway ◽  
High Frequency Vibration ◽  
Vibration Load ◽  
Slab Track ◽  
Ca Mortar

The cement and asphalt mortar (CA mortar) used in the China Railway Track System (CRTS) I ballastless slab track may encounter a coupling fatigue effect under the high-frequency vibration, load and high-and-low temperature cycles, and the deterioration under fatigue may happen during service of the high-speed railway. In this study, the performance degradation and its mechanism of the CA mortar with and without polymer emulsion incorporated under the coupling fatigue effects of the high-frequency vibration, load and temperature were studied by using an anti-fatigue testing device specially developed for the CA mortar used in the ballastless slab track of the high-speed railway. The results showed that the deformation capacity of the CA mortar for CRTS I slab ballastless slab track decreased after fatigue test under simulated service environment, presenting a typical brittle characteristic and an obvious reduction of the ductility and toughness. The Scanning Electron Microscopy (SEM) observation and the mercury intrusion porosimetry (MIP) analysis showed that the volume of the macropore decreased whereas that of the micropore increased after the fatigue test. The asphalt in the hardened CA mortar revealed a softening and migration from the bulk paste to fill the pore and make the structure denser and even ooze out of the CA mortar under the high-frequency vibration and high temperature. Through incorporating the polymer emulsion, the anti-fatigue property of the CA mortar was obviously improved, which can prevent the CA mortar from losing its elastic adjustment function too early. Though increase of the strength and elastic modulus for the CA mortar after severe service is beneficial to the stability of train running, the comfort level and safety of the train operation may decline due to the gradual reduction of the ductility & toughness and the gradual loss of the elastic damping adjustment function of the CA mortar between the base concrete slab and the track slab.

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