Experimental study and numerical simulation of the impact of under-sleeper pads on the dynamic and static mechanical behavior of heavy-haul railway ballast track

IF 4.4 1区 工程技术 Q2 TRANSPORTATION SCIENCE & TECHNOLOGY
Yihao Chi, Hong Xiao, Yang Wang, Zhihai Zhang, Mahantesh M. Nadakatti
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Abstract

Laying the under-sleeper pad (USP) is one of the effective measures commonly used to delay ballast degradation and reduce maintenance workload. To explore the impact of application of the USP on the dynamic and static mechanical behavior of the ballast track in the heavy-haul railway system, numerical simulation models of the ballast bed with USP and without USP are presented in this paper by using the discrete element method (DEM)—multi-flexible body dynamic (MFBD) coupling analysis method. The ballast bed support stiffness test and dynamic displacement tests were carried out on the actual operation of a heavy-haul railway line to verify the validity of the models. The results show that using the USP results in a 43.01% reduction in the ballast bed support stiffness and achieves a more uniform distribution of track loads on the sleepers. It effectively reduces the load borne by the sleeper directly under the wheel load, with a 7.89% reduction in the pressure on the sleeper. Furthermore, the laying of the USP changes the lateral resistance sharing ratio of the ballast bed, significantly reducing the stress level of the ballast bed under train loads, with an average stress reduction of 42.19 kPa. It also reduces the plastic displacement of ballast particles and lowers the peak value of rotational angular velocity by about 50% to 70%, which is conducive to slowing down ballast bed settlement deformation and reducing maintenance costs. In summary, laying the USP has a potential value in enhancing the stability and extending the lifespan of the ballast bed in heavy-haul railway systems.

Abstract Image

轨枕下垫对重载铁路无砟轨道动静态机械性能影响的实验研究与数值模拟
铺设卧铺下垫(USP)是延缓无砟轨道退化和减少维护工作量的有效措施之一。为探讨铺设 USP 对重载铁路系统无砟轨道动静力学行为的影响,本文采用离散元法(DEM)-多柔性体动力学(MFBD)耦合分析方法,给出了有 USP 和无 USP 无砟道床的数值模拟模型。为了验证模型的有效性,在一条重载铁路线的实际运营中进行了道碴床支撑刚度测试和动态位移测试。结果表明,使用 USP 后,无砟道床支撑刚度降低了 43.01%,轨枕上的轨道荷载分布更加均匀。它有效降低了枕木在车轮荷载下直接承受的荷载,使枕木上的压力降低了 7.89%。此外,USP 的铺设改变了无砟道床的横向阻力分担比,大大降低了无砟道床在列车荷载作用下的应力水平,平均应力降低了 42.19 kPa。它还能减少道碴颗粒的塑性位移,使旋转角速度的峰值降低约 50%至 70%,有利于减缓道碴床的沉降变形,降低维护成本。总之,在重载铁路系统中,铺设 USP 具有增强道碴床稳定性和延长道碴床使用寿命的潜在价值。
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来源期刊
Railway Engineering Science
Railway Engineering Science TRANSPORTATION SCIENCE & TECHNOLOGY-
CiteScore
10.80
自引率
7.90%
发文量
1061
审稿时长
15 weeks
期刊介绍: Railway Engineering Science is an international, peer-reviewed, and free open-access journal that publishes original research articles and comprehensive reviews related to fundamental engineering science and emerging technologies in rail transit systems, focusing on the cutting-edge research in high-speed railway, heavy-haul railway, urban rail transit, maglev system, hyperloop transportation, etc. The main goal of the journal is to maintain high quality of publications, serving as a medium for railway academia and industry to exchange new ideas and share the latest achievements in scientific research, technical innovation and industrial development in railway science and engineering. The topics include but are not limited to Design theory and construction technology System dynamics and safetyElectrification, signaling and communicationOperation and maintenanceSystem health monitoring and reliability Environmental impact and sustainabilityCutting-edge technologiesThe publication costs for Railway Engineering Science are fully covered by Southwest Jiaotong University so authors do not need to pay any article-processing charges.
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