高速铁路地下线振源特性及环境振动传播规律研究
Study on Vibration Source Characteristics and Propagation Law of Environmental Vibration in Underground High-Speed Railway
时速400 km超高速运行下诱发的环境振动问题已引起广泛关注。基于复兴号列车和高速铁路地下线隧道土体参数,建立列车-轨道-隧道-环境土体精细化仿真模型,计算分析地下线振源特性及环境振动传播规律。结果表明:建立的列车-轨道-隧道-环境土体精细化仿真模型预测精度在95%以上;列车运行速度由300 km · h-1提高至400 km · h-1后,钢轨、轨道板和隧道壁的垂向与横向振动加速度明显增加;在列车时速400 km超高速运行下,钢轨、轨道板与隧道壁的振动加速度时域峰值分别达290,137和0.29 m · s-2,最大分频振级分别为156,137和96 dB;随着传播距离的增加,高于63 Hz的高频振动呈现显著衰减趋势,而1~4 Hz低频区间的振动能量却表现出随距离递增的增强特性;振动在由地面0 m传递至60 m的过程中,最大分频振级从79 dB降低至72 dB,并呈现出衰减率不断降低的非线性衰减趋势。
Environmental vibration issues induced by 400 km/h ultra-high-speed operation have drawn widespread attention. Based on the parameters of Fuxing EMU trains and underground tunnel soils, a refined simulation model integrating train, track, tunnel, and soil was established; the characteristics of vibration source and the laws of environmental vibration propagation in underground high-speed railways were calculated and analyzed. Results indicate: Model prediction accuracy exceeds 95%; When the train speed increases from 300 km · h-1 to 400 km · h-1, vertical and lateral vibration accelerations of rail, track plate, and tunnel wall increase significantly; At 400 km/h ultra-high-speed operation, time-domain peak vibration accelerations reach 290,137 and 0.29 m · s-2, respectively, with maximum partial frequency vibration levels of 156,137 and 96 dB as propagation distance increases. High-frequency vibrations above 63 Hz show significant attenuation trends, while vibration energy within the 1 - 4 Hz low-frequency range exhibits amplification. During transmission from ground level (0 m) to 60 m, the maximum partial frequency vibration level decreases from 79 dB to 72 dB, demonstrating nonlinear attenuation with continuously decreasing decay rates.
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国家重点研发计划项目(2022YFB2603400)
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