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Title: S-wave impedance measurements of the uppermost material in surface ground layers: Vertical load excitation on a circular disk
Authors: Goto, Hiroyuki  kyouindb  KAKEN_id  orcid (unconfirmed)
Tanaka, Nobuaki
Sawada, Sumio  kyouindb  KAKEN_id  orcid (unconfirmed)
Inatani, Hideki
Author's alias: 後藤, 浩之
Keywords: S-wave impedance
Elastic wave exploration
Numerical experiment (IGC: C02, E08, G08)
Issue Date: Oct-2015
Publisher: Elsevier B.V.
Journal title: Soils and Foundations
Volume: 55
Issue: 5
Start page: 1282
End page: 1292
Abstract: S-wave impedance is one of the most effective parameters used to study the ground motion amplification of soil deposits. We propose a new approach to measure the S-wave impedance of the uppermost material in surface ground layers. First, a circular disk is set on the ground surface, and it is vertically loaded by sinusoidal wave excitation. When the time series of the loading velocity is synchronized with the reaction force, the ratio of the reaction force to the loading velocity is proportional to the S-wave impedance. We then estimate the proportionality coefficient from numerical experiments and check its accuracy. The measurement error is estimated to be within 1% for the homogeneous half-space case. We also discuss the applicability of this new approach and its limitations on the basis of numerical experiments for inhomogeneous media: a two-layered medium and a one-dimensional (1-D) random medium. The proposed approach is effective for both cases if we select the appropriate circular disk size.
Rights: © 2015. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
The full-text file will be made open to the public on 1 October 2017 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
This is not the published version. Please cite only the published version.
DOI(Published Version): 10.1016/j.sandf.2015.09.026
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