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针对高速铁路和高等级公路的运行产生振动波可能带来严重的噪音和地面振动等环境问题,运用LS-DYNA软件,选用更适合岩土介质的弹塑性模型,对高速列车作用下地面振动及连续墙挡板的防护能力进行三维数值模拟分析。研究了5～20 Hz荷载下混凝土桩组成的不同尺寸挡板的减振效果,并与日本某现场试验结果比较。结果表明,尽管无填充壕沟的防护效果最佳,但钢筋混凝土桩墙更具可操作性,稳定性,且混凝土桩减振挡板可以显著减低地面的振动加速度幅值,与波长有关。挡板长度和深度直接影响混凝土减振挡板的防护效果和防护范围,挡板深度对防护效果的影响更为明显,挡板宽度的尺寸主要影响防护范围。
The vibration caused by the vibration of high-speed railway and high-grade highway may cause serious noise and ground vibration. Using LS-DYNA software, the elastic-plastic model which is more suitable for geotechnical media is selected to analyze the vibration of ground under high-speed train Continuous wall baffle protection ability of three-dimensional numerical simulation. The damping effect of different sizes of baffles with concrete piles under 5 ~ 20 Hz load was studied and compared with the results of a field test in Japan. The results show that although the protective effect of unfilled trenches is the best, the reinforced concrete pile wall is more operable and stable, and the vibration damping baffle of concrete pile can significantly reduce the amplitude of ground vibration acceleration, which is related to the wavelength. The length and depth of the baffle directly affect the protective effect and the scope of protection of the concrete baffle. The effect of the depth of the baffle is more obvious. The width of the baffle mainly affects the scope of protection.