Study on a calibration equation for soil water content in field tests using time domain reflectometry

Zhao, Yun, Ling, Dao-sheng, Wang, Yun-long, Huang, Bo and Wang, Hanlin 2016. Study on a calibration equation for soil water content in field tests using time domain reflectometry. Journal of Zhejiang University Science A 17 (3) , pp. 240-252. 10.1631/jzus.A1500065

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Abstract

The crucial point in calibrating soil water content using the technology of time domain reflectometry (TDR) is to establish the relationship between the apparent dielectric constant and the water content. Based on a database, which included 45 kinds of soil samples and 418 data points from our own test data and relevant literature, an empirical calibration equation is proposed. Additionally, the influence of soil type, dry density of soil, compaction energy, pore fluid conductivity, and temperature on the calculated result for water content was also analyzed. Results show that the equation can offer an error of ±0.05 g/g for most soils encountered in geotechnical engineering. However, the estimation error given by the empirical equation becomes significant for soils with dry density less than 1.3 g/cm3, so the equation was modified to consider the influence of dry density. Both of the empirical equations can be used to test gravimetric water content using the TDR method conveniently and efficiently without calibration

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Publisher:	Springer Verlag (Germany)
ISSN:	1673-565X
Date of First Compliant Deposit:	3 January 2019
Date of Acceptance:	8 July 2015
Last Modified:	14 Dec 2020 02:29
URI:	https://orca.cardiff.ac.uk/id/eprint/118069

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