均质介质中排桩对瑞利波的阻隔试验分析

本文通过室外试验的方法并绘制二维等值线图以及将波长和双桩变量进行归一化处理来分析瑞利波通过双桩时周边土体振动的变化，结果表明：在桩间、桩前存在振动加强的现象，其中桩间以及桩角处振动强度最大；桩长与波长的比值的增加会使得桩前、桩间土体振动加强，同时也会使得双桩的隔振效果提升。当比值为0.691~0.781的范围内时，各点处变化幅度趋于平缓；桩间距的增加会使得双桩失去相互影响作用，当桩间距与波长的比值在0.34~0.42时，桩前、桩间以及桩后的A_r值趋近于1，即不存在振动加强以及衰减现象；桩径的增加可提升双桩的隔振效果，同时随着桩径与波长的比值增加，桩前、桩间的A_r值均有较小幅度的增加；振源距的增加会使得双桩的隔振效果增强，随着振源距与波长的比值的增加，桩前的A_r值降低了0.13左右，桩间仅仅降低了0.068左右，而桩后的A_r值降低了0.108左右，隔振效果增强，但增强的幅度较小。

Test on the Dilution Effect on the Rayleigh Wave of Row Piles in Homogeneous Medium

In this study, we used an outdoor testing method to draw a two-dimensional contour map, and we normalized the wavelength and double-pile variables to analyze the vibration of the surrounding soil when a Rayleigh wave passes through a double pile. The results show that the vibration in the soil strengthens between and in front of the piles, with the greatest vibration intensity in the soil is between the piles and at the pile angle. Increases in the ratio of the pile length to wavelength strengthen the vibration of the soil between and in front of the piles, and also improve the vibration-isolation effect of double piles. When the ratio is in the range of 0.691-0^781, the variation range of each point is gentle. An increase in the pile spacing causes double piles to lose their mutual influence. When the ratio of the pile spacing to wavelength is between 0^34 and 0.42, the A_r value of the soil between, in front of, and behind the piles approaches 1, i.e., there is no vibration strengthening or attenuation. Increasing the pile diameter can improve the vibration-isolation effect of double piles, whereby as the ratio of the pile diameter to the wavelength increases, the A_r values of the soil between and in front of the piles increase slightly. An increase in the distance of the vibration source strengthens the vibration-isolation effect of double piles. As the ratio of the vibration-source distance to the wavelength increases, the A_r value of soil in front of the pile decreases by about 0.13, that between the piles decreases by about 0^068, and that behind the pile decreases by approximately 0.108. The vibration-isolation effect is also enhanced, but the amplitude of this enhancement is small.