This paper presents a study of the isolation performance of trenches on train-induced ground-bore vibration from underground tunnels. A series of model tests was conducted to perform the study. Both train loads and sinusoidal sweep loads were applied to the model tunnel invert by a shaker. The response of the soil at the surface of the ground was measured by accelerometers. Three types of isolation trenches, i.e., an open trench, an expanded Polystyrene (EPS)-filled trench, and a Duxseal-filled trench, were modelled in the experiment. The results showed that the open trench and the EPS-filled trench increased the dynamic response of the surface soil in front of the trench, but the Duxseal-filled trench had little effect on the dynamic response of the soil on the surface in this area. Although all three types of isolation trenches reduced the response of the soil behind the trench, the open trench and the Duxseal-filled trench were clearly more effective. The test results also showed that, as the excitation frequency increased, the vibration isolation trench was more effective in the near field. The effects of the width, depth, and position of an open trench on isolation performance also were examined in the tests.

中文翻译：

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地下隧道对地下传播的地面振动隔离性能的试验研究

本文介绍了沟槽对列车引起的地下隧道地震动的隔离性能的研究。进行了一系列模型测试以进行研究。通过振动器将列车载荷和正弦波扫描载荷都施加到模型隧道的反演上。用加速度计测量土壤在地面上的响应。在实验中对三种类型的隔离沟槽进行了建模，即敞开沟槽，膨胀聚苯乙烯（EPS）填充沟槽和Duxseal填充沟槽。结果表明，开放式沟槽和EPS填充沟槽增加了沟槽前表层土壤的动力响应，而Duxseal填充沟槽对该区域表层土壤的动力响应影响很小。尽管所有这三种类型的隔离沟槽都降低了沟槽后面土壤的响应，但敞开沟槽和充满Duxseal的沟槽显然更有效。测试结果还表明，随着激励频率的增加，隔振沟槽在近场中更有效。在测试中还检查了开口沟槽的宽度，深度和位置对隔离性能的影响。