Influence of water immersion on dynamic characteristics of heavy-haul railway reinforced subgrade

doi:10.3785/j.issn.1008-973X.2024.11.018

Journal of ZheJiang University (Engineering Science)

2024, Vol. 58

Issue (11): 2364-2375 DOI: 10.3785/j.issn.1008-973X.2024.11.018

Influence of water immersion on dynamic characteristics of heavy-haul railway reinforced subgrade

Lihua LI1,2(

),Shuguang JIANG1,2,Lifang MEI1,2,*(

),Yiming LIU1,2

1. School of Civil Engineering, Architecture and the Environment, Hubei University of Technology, Wuhan 430068 , China
2. Key Laboratory of Health Intelligent Perception and Ecological Restoration of River and Lake, Ministry of Education, Wuhan 430068, China

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Abstract

The dynamic load effect of different axle heavy train was simulated by indoor model experiment in order to solve the problem that the roadbed performance of heavy haul railway decreased after wetting, which affected the safety of train running. The dynamic characteristics and long-term stability of reinforced roadbed of heavy haul railway before and after soaking were analyzed. Results show that the stress, settlement and acceleration of the plain soil roadbed increase significantly after soaking. The maximum stress and the settlement of sleeper decrease by 21% and 20% respectively, the maximum stress of composite reinforced roadbed decreases by 23% , and the settlement of sleeper decreases by 30%. The reinforcement can improve the strength of subgrade, make the superstructure of subgrade more stable and reduce the acceleration of subgrade. The stress attenuation coefficient of each layer of roadbed increases after soaking, and the reinforcement makes the stress attenuation coefficient and the stress vertical diffusion depth decrease. The reinforcement can reduce the peak value of pore water pressure and increase the dissipation rate of pore water pressure. Geotextile can keep the properties of ballast layer and reduce the fouling of ballast layer after soaking.

Key words： water immersion heavy-loaded railway reinforced subgrade stress acceleration settlement pore water pressure

Received: 14 September 2023 Published: 23 October 2024

CLC:

TU 239

Fund: 国家自然科学基金资助项目（52278347)；湖北省基金创新群体资助项目（2024AFA009）；湖北省高等学校优秀中青年科技创新团队资助项目（T2023006）；湖北工业大学杰出人才基金资助项目（XJ2021000501).

Corresponding Authors: Lifang MEI E-mail: researchmailbox@163.com;meilfhg@163.com

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Cite this article:

Lihua LI,Shuguang JIANG,Lifang MEI,Yiming LIU. Influence of water immersion on dynamic characteristics of heavy-haul railway reinforced subgrade. Journal of ZheJiang University (Engineering Science), 2024, 58(11): 2364-2375.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2024.11.018 OR https://www.zjujournals.com/eng/Y2024/V58/I11/2364

浸水对重载铁路加筋路基动力特性的影响

为了解决重载铁路路基湿化后路基性能下降，影响列车行车安全的问题，通过室内模型实验模拟不同轴重列车动载作用，研究浸水前、后重载铁路加筋路基的动力特性及长期稳定性. 结果表明，浸水后素土路基的应力、沉降、加速度会显著增大；浸水后与素土路基相比，格室加筋后路基最大应力下降21%，轨枕沉降下降20%，复合加筋路基的最大应力下降23%，轨枕沉降下降30%，复合加筋效能优于格室加筋. 加筋可以提高路基强度，使路基的上部结构更稳定，降低路基加速度. 浸水后路基各层的应力衰减系数增大，加筋使应力衰减系数和应力竖向扩散深度减小. 加筋可以降低路基孔隙水压力峰值，提高孔隙水压力的消散速度. 浸水后土工布可以保持道砟层性能，减轻道砟污化.

关键词： 浸水, 重载铁路, 加筋路基, 应力, 加速度, 沉降, 孔隙水压力

Fig.1 Test system of traffic load model

Tab.1 Parameter of geotextile engineering

Fig.2 Ballast grading curve

Fig.3 Model and sensor arrangement position

Fig.4 Laying location of reinforced material

Tab.2 Summary of loading parameter

Tab.3 Train load test program

Tab.4 Comparison of peak stress of subgrade

Fig.5 Transverse distribution of dispatching stress in subgrade under different axle weight

Fig.6 Transverse distribution of subgrade settlement under different axle load

Fig.7 Lateral distribution of peak acceleration at each position in subgrade under different axle weight

Fig.8 Peak variation of each data under different axis weight

Fig.9 Longitudinal distribution of each subgrade stress under different axle weight

Fig.10 Dynamic stress attenuation coefficient of each subgrade under different axle weight

Fig.11 Change curve of subgrade settlement with loading times

Fig.12 Contrast between before and after laying geotextile in subgrade after soaking

Fig.13 Curve of pore water pressure with loading times


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