Influence of Stress-Free Temperature Difference on Force Characteristics of Seamless Turnouts in Plateau Areas

GAO Yuan; YANG Dongsheng; WANG Shuguo

doi:10.3969/j.issn.0258-2724.20230222

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GAO Yuan, YANG Dongsheng, WANG Shuguo. Influence of Stress-Free Temperature Difference on Force Characteristics of Seamless Turnouts in Plateau Areas[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230222

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GAO Yuan, YANG Dongsheng, WANG Shuguo. Influence of Stress-Free Temperature Difference on Force Characteristics of Seamless Turnouts in Plateau Areas[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230222

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Influence of Stress-Free Temperature Difference on Force Characteristics of Seamless Turnouts in Plateau Areas

doi: 10.3969/j.issn.0258-2724.20230222

Railway Engineering Research Institute, China Academy of Railway Science Corporation Limited, Beijing 100081, China

Received Date: 09 May 2023
Rev Recd Date: 30 Jun 2023

Available Online: 09 Jul 2024

Abstract

Abstract

To investigate the feasibility of laying seamless turnouts in plateau areas and the influence of plateau climate on the stability of seamless turnouts across areas, the effect of stress-free temperature difference on the force characteristics of seamless turnouts under different climates, elevations, and structural types was analyzed. First, based on the physic-geographical environment and operating conditions of railways in plateau areas, the typical seamless turnouts of the Qinghai−Xizang line during upgrading were selected as research objects, and then the parameter tests of key force transmission components with force characteristics in turnouts under different structural types were conducted, clarifying the influence of the low temperature of plateau climate on resistance force of fasteners and ballast beds. At last, the calculation model of seamless turnouts considering the multi-field coupling effect and plastic resistance force was established, and the relationship between stress-free temperature difference and stress deformation of seamless turnouts was revealed. The results show that when the temperature difference is high, the growth rate of temperature additional force induced by stress-free temperature difference increases from 4.5 kN/℃ (Daqiongguo Station) to 6 kN/℃ (Tanggulabei Station); the stress-free temperature difference between seamless turnouts and adjacent lines or adjacent turnouts has great impact on stress formation of seamless turnouts, and the growth rate of lateral displacement caused by the stress-free temperature difference of the line/turnout rail section increases from 0.010 mm/℃ (Daqiongguo Station) to 0.011 mm/℃ (Tanggulabei Station). The impact of the stress-free temperature difference between left/right or straight/side rails on turnout stability is small. In plateau areas, the turnout involves the locking of multiple strands of rail, which is easy to cause a large stress-free temperature difference. To increase safety redundancy, the stress-free temperature difference should be controlled within ±3 ℃, while that of the adjacent rail section should be no more than 5 ℃.
- railway in plateau,
- seamless turnout,
- stress-free temperature difference,
- temperature force,
- longitudinal displacement

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