As a practical countermeasure against generally destructive subway-induced vibrations, the injection of a continuous thin layer of soft materials into the soil under adjacent receivers is investigated in this paper for the first time. To this aim, simulations were carried out using a finite/infinite element model of a railway track, tunnel, and surrounding soil. A straightforward analytical approach was implemented to model the dynamic excitation of the moving train. In addition, the effect of a soft V-shaped grouted layer on vibration mitigation on the ground was evaluated via a parametric analysis that determined the impacts of soil type, grout specifications, and train speed. The obtained results clearly indicated that a softer isolator (i.e., the grouted layer) in combination with a stiffer soil provides the best configuration for attenuating the subway-induced vibrations. Furthermore, the injection angle and train speed were shown to have minimal impacts on the isolator performance. Other contributions of the present paper include developing a simple equation to estimate the grouted layer effectiveness and describing how the isolator works in layered soils.

作为对抗一般破坏性地铁诱发振动的实际对策，本文首次研究了将连续薄层软材料注入相邻接收器下方的土壤中。为此，使用铁路轨道、隧道和周围土壤的有限/无限元模型进行了模拟。实施了一种简单的分析方法来模拟移动列车的动态激励。此外，通过确定土壤类型、灌浆规格和列车速度的影响的参数分析，评估了软 V 形灌浆层对减轻地面振动的影响。获得的结果清楚地表明，更软的隔离器（即，灌浆层）与较硬的土壤相结合，为衰减地铁引起的振动提供了最佳配置。此外，注射角度和列车速度对隔离器性能的影响很小。本文的其他贡献包括开发一个简单的方程来估计灌浆层的有效性，并描述隔离器如何在分层土壤中工作。