[논문]Biot 파동전파 이론을 이용한 지반의 투수계수 산정

송정락; 김진원

doi:10.7843/kgs.2020.36.12.7

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

韓國地盤工學會論文集 = Journal of the Korean geotechnical society, v.36 no.12, 2020년, pp.7 - 16

송정락 (Dept. of Civil Engrg., Univ. of Nebraska-Lincoln) , 김진원 (Samsung Engrg. Ltd.)

초록
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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.

Abstract ▼ AI-Helper

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 a 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.

주제어

표/그림 (10)

그림 Fig. 1. Typical frequency dependent 1/Q and V_p curve (f_c = characteristic)
그림 Fig. 2. Schematics of test configuration
그림 Fig. 3. Particle distribution curve
표 Table 1. General properties and components of test samples
그림 Fig. 4. Evaluation of 1/Q and V_p for the dry specimens
그림 Fig. 5. Evaluation of 1/Q and V_p for saturated sand specimens
그림 Fig. 6. Evaluation of 1/Q and V_p for saturated sand-bentonite mixture specimens
그림 Fig. 7. Variation of characteristic frequency with consolidation time for the SQB1 and SOB1 specimens
그림 Fig. 8. Estimated hydraulic conductivity for the SQB1 and SOB1 specimens
그림 Fig. 9. Comparison of DC and AC hydraulic conductivity

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가설 설정

(3) Both the 1/Q and velocity spectra show the same characteristic frequency. However, velocity spectra present a more consistent characteristic frequency.
8. Any free water was removed from the surface of the soil.

제안 방법

In addition, because of the added fine material, time dependent variation of soil properties due to self-weight consolidation was expected. Acoustic measurements were made with 1, 3, 5, 10, 15, and 20 day time intervals. Figure 7 shows the variation of characteristic frequency with time for SQB1 and SOB1.
The comparison of 1/Q and velocity spectra which is made in this study verifies the reliability of the acoustic technique to estimate the hydraulic conductivity of sandy soils. Two sand and two sand-bentonite mixture specimens were studied under dried and saturated conditions.
The test setup in this study was similar to the one presented by Song et al. (2008), but this study used a smaller diameter acoustic source (Aquarian Audio Products, Hydrophone H-1) to create more uniform far field conditions. A function generator (Agilent Technologies, 33220A) was used to supply a single cycle sinusoidal wave with a 0° phase angle.
This study adopted Biot’s coupled theory of mixtures to explore the possibility of estimating the hydraulic conductivity of soils often considered as unconsolidated formations in Geophysics. The characteristic frequency of artificially prepared specimens was measured using two acoustic techniques: (1) attenuation-based measurements and (2) velocity-based measurements.

대상 데이터

measurement system itself. Dry specimens in this study were prepared with air-dried sands. The water contents of SQ and SO specimens were 0.

성능/효과

2. Three identical batches of the material mixtures were prepared to ensure a more even distribution of sand and bentonite throughout the entire specimen. For the first layer, the bentonite (0.

후속연구

of sandy soils. However, further research is needed for finer silty and clayey soils.

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표제어: PCR

동의어: Packet Collision Rate

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