Characteristics of Dynamic Interlayer Stress of CRTS Ⅰ Ballastless Track in Regions with Large Temperature Differences

被引：0

作者：

Zhao, Lei ^{[1
,2
]}

Li, Hao ^{[3
]}

Yang, Guotao ^{[4
]}

Li, Chenxi ^{[5
]}

Shi, Cheng ^{[1
,2
]}

Ning, Na ^{[1
,2
]}

机构：

[1] Railway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing

[2] National Key Laboratory of High, Speed Railway Track System, China Academy of Railway Sciences Corporation Limited, Beijing

[3] Huizhou Housing and Construction Apartment Section, China Railway Guangzhou Co., Ltd., Guangdong, Huizhou

[4] Technology and Information Department, China State Railway Group Co., Ltd., Beijing

[5] School of Traffic and Transportation, Beijing Jiaotong University, Beijing

来源：

Zhongguo Tiedao Kexue/China Railway Science | 2024年 / 45卷 / 04期

关键词：

CRTS Ⅰ ballastless track; Finite element method (FEM); High-speed railway; Interlayer contact; Periodic irregularities; Temperature gradient;

D O I：

10.3969/j.issn.1001-4632.2024.04.04

中图分类号：

学科分类号：

摘要：

In regions with large temperature differences, unit ballastless tracks are subjected to significant temperature gradients caused by solar radiation. This leads to the warping deformation of the track slabs and induces periodic irregularities on the track surface. This, in turn, increases the wheel-rail impact response of high-speed trains and accelerates damage to the track structure. To address this issue, a finite element method was adopted. First, a static analysis model of ballastless track considering interlayer relationships was established to analyze the warping deformation of the track slab and the periodic irregularities of the track surface under large temperature differences. Then, a vehicle-track system dynamics model was developed to simulate and analyze the dynamic interlayer stress characteristics of ballastless tracks under temperature differences and to study the actual service state of tracks under high-speed train operation. The results show that under the influence of temperature gradients, the track slab exhibits an elliptical deformation trend. Under a positive temperature gradient, the middle of the track slab bulges upwards with the four corners being supported, whereas under a negative temperature gradient, the four corners of the track slab lift up with the middle being supported. Temperature gradients result in varying degrees of gaps forming between the track slab and the CA mortar, reducing the contact area beneath the slab. Although the interlayer contact area gradually enlarges during high-speed train operation, the gaps do not fully close. Negative temperature gradients exerts a smaller impact on track structure vibration and mortar layer stress, while positive temperature gradients have a larger impact. When the temperature gradient reaches 90 ℃ · m-1, the vibration acceleration of the track slab increases by approximately tenfold, the maximum pressure between the track slab and the CA mortar layer increases by 6. 6 times, and the stress in the CA mortar at the slab corners increases by 5. 4 times compared to the conditions without a temperature gradient. The significant increase in stress at the sides and corners of the track slab under positive temperature gradients is the main cause of structural damage in the CA mortar in these areas. © 2024 Chinese Academy of Railway Sciences. All rights reserved.

引用

页码：30 / 39

页数：9

共 16 条

[1] WANG Jijun, YOU Ruilin, WANG Meng, Et al., Research on the Slab Temperature Warping of the Unit Slab Track System［J］, China Railway Science, 31, 3, (2010)
[2] DONG Liang, LI Dongsheng, HU Suoting, Comparison Analysis on Stress-Strain Conditions of Longitudinally Connected Slab-Type and Unit Slab-Type Ballastless Tracks under Temperature Gradient Load［J］, Railway Engineering, 56, 5, (2016)
[3] LIU Zengjie, WANG Jijun, WANG Meng, Et al., Study on Control Measures of Warping Deformation in CRTS Ⅲ Pretensioned Track Slab Manufacturing［J］, Chinese Railway, (2016)
[4] FU Chengzhi, LIU Yanwen, Study on Warping and Deformation of CRTS Ⅰ Track Slab on Harbin-Dalian Passenger Dedicated Line［J］, Railway Standard Design, 56, 5, (2012)
[5] CAO Xingang, Research on the Warping Deformation of CRTS Ⅲ Type Track Plate in Severe Cold Area［J］, Journal of Railway Engineering Society, 36, 5, (2019)
[6] ZHANG J W, CAI C B，, Et al., Experimental and Numerical Analysis on Concrete Interface Damage of Ballastless Track Using Different Cohesive Models［J］, Construction and Building Materials, 263, 12, (2020)
[7] Study of Ballastless Track Structure Monitoring by Distributed Optical Fiber Sensors on a Real-Scale Mockup in Laboratory［J］, Engineering Structures, 56, 11, (2013)
[8] FU N., Study on the Length of Unit Twin-Block Ballastless Track Based on Temperature Effect［C］, Transportation Research Board Annual Meeting, (2015)
[9] QIN Yongping, REN Xichong, Research on the Influence of the Warpage Deformation of Track Slab End on the Driving Dynamic Characteristics［J］, Journal of Railway Engineering Society, 37, 10, (2020)
[10] LIU Ping, Xin WU, Hao XU, Dynamic Properties Research of CRTS Ⅲ Slab Track under Slab Ends Cavity［J］, Journal of Railway Science and Engineering, 16, 10, (2019)

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