混凝土排桩主动隔振研究

为研究混凝土排桩桩长、埋深和桩间距对主动隔振的影响,以振幅降低比作为评价指标,将振幅降低比小于0.5的区域定义为有效隔振区域,进行混凝土排桩室外试验。基于本文试验条件,详细分析上述因素对隔振区域的影响。研究结果表明:各因素对隔振区域均有影响。桩长与瑞利波波长的比值越大有效隔振区域越大,但比值为0.5之后,再增加比值有效隔振区域增幅不大,当比值为0.76时,可以获得比较大的有效隔振区域。埋深与瑞利波波长的比值越大有效隔振区域越小,当比值为0.32后,不存在有效隔振区域,较小的埋深可以取得很好的有效隔振区域。桩间距与瑞利波波长的比值越小有效隔振区域越大,当比值为0.27时,有效隔振区域已经很小。

Research on active vibration isolation of concrete rows

In order to study the effect of concrete row pile length, burial depth and pile spacing on active vibration isolation, by conducting an outdoor concrete row pile test, the amplitude reduction ratio was used as the evaluation index, and the area with the amplitude reduction ratio of less than 0.5 was defined as the effective vibration isolation area. Based on the test conditions in this paper, the impact of the above factors on the vibration isolation area was analyzed in detail. The results show that all factors have an impact on the vibration isolation area. The greater the ratio of the pile length to the Rayleigh wave wavelength, the greater the effective vibration isolation area. However, after the ratio reaches 0.5, with the increase of ratio, the effective vibration isolation area does not increase much. When the ratio reaches 0.76, a larger effective vibration isolation area has been obtained. The greater the ratio of the buried depth to the Rayleigh wave wavelength, the smaller the effective vibration isolation area. When the ratio is 0.32, there is no effective vibration isolation area, and a small buried depth can achieve a good effective vibration isolation area. The smaller the ratio of the pile spacing to the Rayleigh wave wavelength is, the larger the effective vibration isolation area is. When the ratio is 0.27, the effective vibration isolation area is already small.