Estimation of Hydraulic Conductivity of Soils Based on Biot’s Theory of Wave Propagation

Chung R. Song; Jinwon Kim; Kianoosh Koocheki

doi:10.7843/kgs.2020.36.12.7

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2020 Vol.36, Issue 12 Next Page

Research Article

Estimation of Hydraulic Conductivity of Soils Based on Biot’s Theory of Wave Propagation Biot 파동전파 이론을 이용한 지반의 투수계수 산정

31 December 2020. pp. 7-16

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Abstract

This study presents an acoustic technique to estimate the hydraulic conductivity of soils. Acoustic attenuation and propagation velocity spectra were measured for dry and saturated sandy specimens to confirm that the relationship between Biot’s characteristic frequency and its associated hydraulic conductivity exists only for saturated soils. From the experiments presented in this paper, both attenuation-based and propagation-velocity-based techniques resulted in almost identical characteristic frequencies for saturated soils. The propagation velocity based measurements, however, show a slightly clearer trend compared to the attenuation based measurements. The results also show that the acoustically estimated hydraulic conductivities of soils agree well with constant head laboratory test results, demonstrating that this acoustic technique can be a useful nondestructive tool to estimate the hydraulic conductivity of sandy or silty soils.

Keywords

AD hydraulic conductivity

Attenuation

Characteristic frequency

Coupled behavior

DC hydraulic conductivity

Theory of mixtures

Wave propagation

본 연구는 음향학적 기법을 이용하여 지반의 투수계수를 산정하는 새로운 방법을 제시하였다. 연구를 위하여 Biot의 특성 진동수(Characteristic Frequency) 와 지반의 투수계수의 연관성이 포화된 지반에서만 나타나는 것을 확인할 수 있도록 음파의 감쇠 및 전파속도 특성을 포화된 시료와 건조된 시료에 대하여 측정/비교 하였다. 본 연구에서의 시험결과는 특성 진동수는 포화된 지반에서만 나타나며, 음파의 감쇠 특성으로 부터 얻은 특성 진동수와 전파속도 특성으로 부터 얻은 특성 진동수가 서로 매우 유사한 범위를 나타내었다. 한편 음파의 전파속도로 부터 얻은 결과가 감쇠 특성으로부터 얻은 결과보다 판독성이 좀 더 좋은 것으로 나타났다. 또한 본 시험결과를 동일한 시료에 대한 정수위 투수시험결과와 비교했을때 서로가 합리적으로 상응하는 결과를 나타내었으며, 본 연구에서 사용된 음향학적 기법이 사질토 또는 실트질 사질토의 투수계수를 구할 수 있는 비파괴 시험으로 사용될 수 있는 가능성을 보여 주었다.

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Information

Publisher :The Korean Geotechnical Society
Publisher(Ko) :한국지반공학회
Journal Title :Journal of the Korean Geotechnical Society
Journal Title(Ko) :한국지반공학회 논문집
Volume : 36
No :12
Pages :7-16
Received Date : 2020-05-22
Revised Date : 2020-09-10
Accepted Date : 2020-09-10
DOI :https://doi.org/10.7843/kgs.2020.36.12.7

Journal of the Korean Geotechnical Society ISSN:1229-2427(Print) 2288-646X(Online) 한국지반공학회 논문집

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