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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Dynamic responses of subgrade under double-line high-speed railway
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Dynamic responses of subgrade under double-line high-speed railway

机译：双线高速铁路路基动力响应

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摘要

The majority of high-speed railways around the world is in China and more than 90% of the high-speed railways in China are double-line. At present, studies on the dynamic responses of subgrade under double-line high-speed railways are quite limited due to the complexity of these railways. In this study, a three-dimensional finite element model was developed using ABAQUS software for a double-line ballastless track-subgrade system subject to 8-carriage moving constant loads. The dynamic responses (specifically the vertical stress, displacement, velocity and acceleration) were determined at three points on the subgrade surface (Point A, Point B, and Point C) for trains travelling at different speeds (250, 300, and 360 km/h) and line patterns (unidirectional and bidirectional operations). The vertical stress distributions at selected points on the subgrade surface at these train speeds and line patterns are presented, and the vertical stress distributions along the soil depth of the subgrade at Point A and Point B are discussed. The key findings of this study are as follows. The maximum vertical displacement at the three observation points decreases as the train speed increases whereas the absolute maximum vertical velocity slightly increases as the train speed increases. In bidirectional operation, the maximum vertical stresses occur under the rails on the subgrade surface and the stress distributions are asymmetric. At Point A (point on the subgrade surface underneath the left rail in the left line), the vertical stress decreases along the soil depth and the vertical stress attenuation is more pronounced for bidirectional operation. However, at Point B (point at the centre of the subgrade surface), the vertical stress increases along the soil depth. The vertical stresses at Point A and Point B tend to be close to one another with an increase in soil depth such that the values are nearly coincident in the embankment layer within the range of train speeds investigated in this study.
机译：全世界大多数高速铁路都在中国，而中国90％以上的高速铁路都是双线。目前，由于双线高速铁路的复杂性，对路基动力响应的研究十分有限。在这项研究中，使用ABAQUS软件为双线无ball轨道-路基系统开发了三维有限元模型，该系统承受8车架移动恒定载荷。动态响应（特别是垂直应力，位移，速度和加速度）是在列车以不同速度（250、300和360 km /）行驶时在路基表面上的三个点（A点，B点和C点）确定的h）和线型（单向和双向操作）。给出了在这些列车速度和线型下路基表面选定点的垂直应力分布，并讨论了沿路基土壤深度在A点和B点的垂直应力分布。这项研究的主要发现如下。三个观测点的最大垂直位移随列车速度的增加而减小，而绝对最大垂直速度随列车速度的增加而略有增加。在双向运行中，最大垂直应力出现在路基表面的轨道下方，并且应力分布不对称。在A点（左行中左轨道下方路基表面上的点），垂直应力沿土壤深度减小，并且双向操作的垂直应力衰减更为明显。但是，在B点（路基表面中心），垂直应力沿土壤深度增加。随着土层深度的增加，A点和B点的垂直应力趋于彼此接近，因此在本研究研究的列车速度范围内，路堤层中的应力几乎重合。

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