| Issue |
E3S Web of Conf.
Volume 382, 2023
8th International Conference on Unsaturated Soils (UNSAT 2023)
|
|
|---|---|---|
| Article Number | 22005 | |
| Number of page(s) | 6 | |
| Section | Long-Term Measurements of Suction in the Field and their Relation to Climatic Parameters - Part I | |
| DOI | https://doi.org/10.1051/e3sconf/202338222005 | |
| Published online | 24 April 2023 | |
A prototype for water content measurement in partially saturated soils
1 formerly Scuola Superiore Meridionale, Largo S. Marcellino, 10, 80138 Napoli, Italy
2 Università degli studi di Napoli Federico II, Dipartimento di Ingegneria Civile, Edile e Ambientale, Via Claudio, 21, 80125 Napoli, Italy
3 Università degli studi di Napoli Federico II, Dipartimento di Ingegneria Elettrica e delle Tecnologie dell’Informazione, Via Claudio, 21, 80125 Napoli, Italy
* Corresponding author: simona.guglielmi@unina.it
The paper presents the technological set-up and calibration of a system based on impedance spectroscopy for measuring water content in partially saturated soils. The technique adopted is relatively recent in geotechnical practice; it is used herein to characterize the electrical response of a soil specimen among two conducting electrodes upon application of an alternate voltage and the measurement of the current intensity resulting across the specimen, for frequency values in the range [500 Hz – 50 kHz]. The complex impedance of the soil specimen is due to both resistance, i.e. opposition to current, and reactance, i.e. tendency of the system to yield and retrieve energy, and it depends on the specimen water content. An on-purpose experimental plan has been conceived and is presented herein, aimed at building a calibration function for deriving the water content in pyroclastic soils from the impedance measurements. Preliminary results reveal an adequate level of repeatability of the measurements and suggest the existence of a monotonic correlation between the impedance modulus and the gravimetric water content.
© The Authors, published by EDP Sciences, 2023
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