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Determining Shrinkage Cracks Based on the Small-Strain Shear Modulus-Suction Relationship

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Title: Determining Shrinkage Cracks Based on the Small-Strain Shear Modulus-Suction Relationship
Authors: Shrestha, Avishek Browse this author
Jotisankasa, Apiniti Browse this author
Chaiprakaikeow, Susit Browse this author
Pramusandi, Sony Browse this author
Soralump, Suttisak Browse this author
Nishimura, Satoshi Browse this author →KAKEN DB
Keywords: shrinkage crack
unsaturated soil
soil water retention curve (SWRC)
spectral analysis of surface wave (SASW)
free-free resonant frequency (FFR)
small-strain shear modulus
Issue Date: Sep-2019
Publisher: MDPI
Journal Title: Geosciences
Volume: 9
Issue: 9
Start Page: 362
Publisher DOI: 10.3390/geosciences9090362
Abstract: This research aims to propose the use of spectral analysis of surface wave (SASW) tests along with in-situ suction measurements for non-destructive determination of shrinkage cracks. The underlying principle behind this proposed method is that, while suction and the small-strain shear modulus are positively correlated for intact samples, this is not the case for cracked ground. A series of SASW tests were performed on a clay embankment at different periods, during which the suction, modulus, and shrinkage crack depth varied seasonally. The soil water retention curve (SWRC) of the undisturbed sample collected from the cracked zone was determined, which related the suction-to-moisture content and void ratio of the soil. A free-free resonant frequency (FFR) test in the lab was conducted to determine the small-strain shear modulus (G(0)) at various moisture contents. The small-strain moduli from the SASW tests on the intact ground were generally higher than those from the FFR tests due to the effect of confining stress. A drop in the small-strain modulus determined using the SASW test was observed as an increase in suction-induced cracks and it relieved the horizontal stress. The crack depth measured in the field was then modelled using a semi-empirical procedure that can be used to predict crack depth relative to suction.
Rights: © 2019 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/).
http://creativecommons.org/licenses/by/4.0/
Type: article
URI: http://hdl.handle.net/2115/76015
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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