Department of Civil Engineering, University of La Coruña, 15071 La Coruña, Spain.
Department of Civil Engineering, University of Porto, 4200-465 Porto, Portugal.
Int J Environ Res Public Health. 2020 Dec 9;17(24):9191. doi: 10.3390/ijerph17249191.
The use of piles as barriers to mitigate vibrations from rail traffic has been increasing in theoretical and practical engineering during the last years. Tyre-derived aggregate (TDA) is a recycled material with some interesting applications in civil engineering, including those related to railway engineering. As a novelty, this paper combines the concept of pile wave barriers and TDA material and investigates the mitigation effect of pile barriers made of TDA on the vibrations transmitted by rail traffic. This solution has a dual purpose: the reduction of railway vibrations and the recycling of a highly polluting material. The mitigation potential of this material when used as backfill for piles is analysed using a numerical scheme based on a 3D finite-difference numerical model formulated in the space/time domain, which is also experimentally validated in this paper in a real case without pile barriers. The numerical results show insertion loss (IL) values of up to 11 dB for a depth closed to the wavelength of Rayleigh wave. Finally, this solution is compared with more common backfills, such as concrete and steel tubular piles, showing that the TDA pile is a less effective measure although from an environmental and engineering point of view it is a very competitive solution.
近年来，在理论和实际工程中，使用桩作为障碍物来减轻铁路交通引起的振动的情况越来越多。轮胎衍生骨料（TDA）是一种具有一些有趣的土木工程应用的回收材料，包括与铁路工程相关的应用。作为一项新颖性，本文结合了桩波屏障的概念和 TDA 材料，并研究了由 TDA 制成的桩屏障对铁路交通引起的振动的减轻效果。该解决方案具有双重目的：减少铁路振动和回收高度污染的材料。本文使用基于空间/时间域中公式化的 3D 有限差分数值模型的数值方案分析了这种材料作为桩回填材料的减轻潜力，并在没有桩屏障的实际案例中进行了实验验证。数值结果表明，对于接近瑞利波波长的深度，插入损耗（IL）值高达 11dB。最后，将该解决方案与更常见的回填材料（如混凝土和钢管桩）进行了比较，表明 TDA 桩虽然从环境和工程角度来看是一种非常有竞争力的解决方案，但它是一种效果较差的措施。
