Experimental analysis of 3D cracking in drying soils using Ground Penetrating Radar

Journal article


Levatti, HU (2017). Experimental analysis of 3D cracking in drying soils using Ground Penetrating Radar. Geotechnical Testing Journal. 40 (2). https://doi.org/10.1520/GTJ20160066
AuthorsLevatti, HU
Abstract

This paper describes the capabilities of a novel technique to investigate crack formation and propagation in drying soils. The technique is a relatively simple, non-destructive indirect technique using a ground-penetrating-radar (GPR) system to detect cracks that form and propagate inside a soil specimen during desiccation. Although GPR devices have been used for multiple applications, their use in soils for the detection of small desiccation cracks has not been demonstrated yet. The experiment and the methodology used to test the accuracy of a small compact commercial GPR device for crack identification are described. The main objective was to identify what type of signals and what crack width and separation between them can be detected using the GPR device. The results indicate that cracks of 1 or 2 mm wide can be detected depending on its position and shape, whereas sub-millimetre cracks are undetectable with the currently existing devices in the market. Regardless of this limitation, the GPR method can be useful to find time-related bounds of when the cracks appear, to point at their location and sometimes at the separation between two of them.Detection of cracks with origin at the bottom or within the specimen was accomplished with this system. Distances of 5 cm or more between cracks can be detected and measured, as well, with accuracy.

KeywordsDesiccation cracks; auscultation; ground-penetrating radar; GPR; 0905 Civil Engineering; Geological & Geomatics Engineering
Year2017
JournalGeotechnical Testing Journal
Journal citation40 (2)
PublisherAmerican Society for Testing and Materials
ISSN0149-6115
Digital Object Identifier (DOI)https://doi.org/10.1520/GTJ20160066
Publication dates
Online28 Feb 2017
Publication process dates
Deposited27 Feb 2017
Accepted26 Oct 2016
Accepted author manuscript
License
File Access Level
Open
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2016 GTJ-LevPraLed-2016-Manuscript-Revised.pdf
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