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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Field experiment and numerical study on active vibration isolation by horizontal blocks in layered ground under vertical loading
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Field experiment and numerical study on active vibration isolation by horizontal blocks in layered ground under vertical loading

机译：竖向荷载作用下分层地基中水平块主动隔振的现场试验与数值研究

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In this paper, a series of field experiments were carried out to investigate the active vibration isolation for a surface foundation using horizontal wave impedance block (WIB) in a multilayered ground under vertical excitations. The velocity amplitude of ground vibration was measured and the root-mean-square (RMS) velocity is used to evaluate the vibration mitigation effect of the NIB. The influences of the size, the embedded depth and the shear modulus of the WIB on the vibration mitigation were also systematically examined under different loading conditions. The experimental results convincingly indicate that WIB is effective to reduce the ground vibration, especially at high excitation frequencies. The vibration mitigation effect of the WIB would be improved when its size and shear modulus increase or the embedded depth decreases. The results also showed that the WIB may amplify rather than reduce the ground vibration when its shear modulus is smaller or the embedded depth is larger than a threshold value. Meanwhile, an improved 3D semi-analytical boundary element method (BEM) combined with a thin layer method (TLM) was proposed to account for the rectangular shape of the used WIB and the laminated characteristics of the actual ground condition in analyzing the vibration mitigation of machine foundations. Comparisons between the field experiments and the numerical analyses were also made to validate the proposed BEM. (C) 2014 Elsevier Ltd. All rights reserved.
机译：本文进行了一系列现场实验，以研究在垂直激励下多层地基中使用水平波阻抗块（WIB）的地基主动隔振技术。测量了地面振动的速度振幅，并使用均方根（RMS）速度来评估NIB的减震效果。在不同的载荷条件下，还系统地研究了WIB的尺寸，埋入深度和剪切模量对减振的影响。实验结果令人信服地表明，WIB可以有效减少地面振动，尤其是在高激励频率下。当其尺寸和剪切模量增加或埋入深度减小时，将改善WIB的减振效果。结果还表明，当WIB的剪切模量较小或嵌入深度大于阈值时，可能会放大而不是减小地面振动。同时，提出了一种改进的3D半解析边界元方法（BEM）与薄层方法（TLM）结合，以考虑所用WIB的矩形形状和实际地面条件的叠层特性，从而分析了减振的振动。机器基础。现场实验和数值分析之间也进行了比较，以验证所提出的边界元法。 （C）2014 Elsevier Ltd.保留所有权利。

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