Numerical analysis of high-speed railway slab tracks using calibrated and validated 3D time-domain modelling
Numerical analysis of high-speed railway slab tracks using calibrated and validated 3D time-domain modelling
复制标题
DOI：
10.1007/s40534-023-00315-3
复制
发表时间：
2023-08
影响因子：
6.3
通讯作者：
A. Esen;O. Laghrouche;P. Woodward;D. Medina-Pineda;Q. Corbisez;J. Shih;D. Connolly
中科院分区：
文献类型：
--
作者：
A. Esen;O. Laghrouche;P. Woodward;D. Medina-Pineda;Q. Corbisez;J. Shih;D. Connolly
混凝土板广泛应用于现代铁路中，以提高轨道的固有弹性质量，提供安全平稳的行驶，并减少维护频率。本文利用 Abaqus 中的三维有限元建模研究了一种新型高速铁路板式轨道模板的弹性性能。然后将其与有碴轨道的性能进行比较。首先，开发板式和有碴轨道模型来复制轨道部分的全面测试。一旦用实验结果校准模型，就会开发出新颖的板式模型，并将其与校准的板式轨道结果进行比较。然后，考虑轨道地球动力学，并模拟不同速度下的列车通道，扩展板式轨道和有碴轨道模型以创建线性动态模型，为此使用 Ledsgård 记录的案例来验证模型。分析低速和高速行驶的列车，以研究轨道偏转和土壤中的波传播，同时考虑与临界速度相关的问题。讨论了各种列车装载方法，并保留和描述了最实用的方法。此外，还建立了现代高铁岩土参数与常规标准之间的相关性。研究发现，考虑到相同的地面条件，高速时板式轨道的挠度明显小于有砟轨道的挠度，而低速时则表现出相似的行为。
Concrete slabs are widely used in modern railways to increase the inherent resilient quality of the tracks, provide safe and smooth rides, and reduce the maintenance frequency. In this paper, the elastic performance of a novel slab trackform for high-speed railways is investigated using three-dimensional finite element modelling in Abaqus. It is then compared to the performance of a ballasted track. First, slab and ballasted track models are developed to replicate the full-scale testing of track sections. Once the models are calibrated with the experimental results, the novel slab model is developed and compared against the calibrated slab track results. The slab and ballasted track models are then extended to create linear dynamic models, considering the track geodynamics, and simulating train passages at various speeds, for which the Ledsgård documented case was used to validate the models. Trains travelling at low and high speeds are analysed to investigate the track deflections and the wave propagation in the soil, considering the issues associated with critical speeds. Various train loading methods are discussed, and the most practical approach is retained and described. Moreover, correlations are made between the geotechnical parameters of modern high-speed rail and conventional standards. It is found that considering the same ground condition, the slab track deflections are considerably smaller than those of the ballasted track at high speeds, while they show similar behaviour at low speeds.