Phase and amplitude responses associated with the measurement of shear-wave velocity in sand by bender elements
Phase and amplitude responses associated with the measurement of shear-wave velocity in sand by bender elements
复制标题
与弯曲元件测量沙子中的剪切波速度相关的相位和幅度响应
DOI：
10.1139/t01-106
复制
发表时间：
2000
影响因子：
3.6
通讯作者：
P. Woodward
中科院分区：
文献类型：
--
作者：
J. Blewett;I. J. Blewett;P. Woodward
弯曲元件在实验室砂样中测得的剪切波速度被证明是依赖于激励频率，并表现出一个有限的频率的最大速度。通过比较色散的相对影响，由于传播的剪切波通过砂和色散由于弯曲元件性能在砂中，我们表明，这两个过程的组合是需要解释的意见。弯曲元件和砂的总响应的大小意味着，如果没有整个系统的频率响应的先验知识，就不能从弯曲元件测试中获得可靠的剪切波速度结果。关键词：剪切波速度，相敏检测，色散，衰减，砂。
Shear-wave velocity measured by bender elements in laboratory sand samples is shown to be dependent upon the excitation frequency and exhibits a maximum velocity for a finite frequency. By comparing the relative effects of dispersion due to propagation of shear waves through sand and dispersion due to bender element performance within sand, we show that a combination of the two processes is required to explain the observations. The magnitude of the aggregate response of the bender elements and the sand implies that reliable shear-wave velocity results cannot be obtained from bender element tests without a prior knowledge of the frequency response of the entire system.Key words: shear-wave velocity, phase-sensitive detection, dispersion, attenuation, sand.