Manso João, Gomes Jorge, Marcelino João
National Laboratory for Civil Engineering, Av. do Brasil 101, Lisbon, Portugal.
Heliyon. 2022 Jul 27;8(7):e10001. doi: 10.1016/j.heliyon.2022.e10001. eCollection 2022 Jul.
The possibility of introducing high-speed trains in Portugal will challenge the regular train circulation of existing railways tracks. To carry this traffic, improvements and maintenance programmes will be intensified together with the evaluation of the railway performance and its consequences on neighbourhood structures, including the execution of several vibration measurement tests. One of them was performed in Lisbon's urban area for measure of ground-borne vibration due to the train traffic. It was used to develop an efficient numerical model, which allowed to study the influence of introducing high-speed vehicles on the generation and propagation of vibrations through the free field and the impact on the wayside buildings. To access the effect of introducing such trains in the existing tracks, three bi-dimensional numerical models for each measurement profile were developed. Numerical models were calibrated using the monitoring records. Then, new simulations were performed with Thalys train allowing to conclude that the introduction of high-speed trains will not lead to an increase of level of vibrations, for the adopted traffic conditions.
在葡萄牙引入高速列车的可能性将对现有铁路轨道上的常规列车运行构成挑战。为承载这一运输量，将加强改善和维护计划，并对铁路性能及其对周边结构的影响进行评估，包括开展多项振动测量测试。其中一项测试在里斯本市区进行，以测量列车运行引起的地面振动。该测试被用于开发一个高效的数值模型，该模型能够研究引入高速车辆对振动在自由场中的产生和传播的影响，以及对沿线建筑物的影响。为评估在现有轨道上引入此类列车的效果，针对每个测量剖面开发了三个二维数值模型。数值模型通过监测记录进行校准。然后，使用thalys列车进行了新的模拟，得出结论：在所采用的交通条件下，引入高速列车不会导致振动水平增加。
