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2013 Vol.12, Issue 2
Water Content Calibration of Time-Domain Reflectometry Probe Using Laboratory Model Test

실내모형실험을 통한 TDR 함수량계의 현장 함수비 보정

Eun Chul Shin1
,
Byung Hyun Ryu2
,
Jeong Jun Park3*
신 은철1
,
류 병현2
,
박 정준3*
1Professor, Dept. of Civil and Environmental Engineering, Incheon National University
2Ph.D. Student, Dept. of Civil and Environmental Engineering, Incheon National University
3Research Professor, Dept. of Civil and Environmental Engineering, Incheon National University
*교신저자. *Corresponding Author. 
30 June 2013. pp. 1-11
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Abstract

Water content of subgrade soil in water supply systems has a large effect on performance. Many researchers lately make use of time-domain reflectometry (TDR) probes to measure the soil water content of subgrade soil from monitoring. The laboratory calibration test of TDR probe should be performed with soil field, because TDR probe can cause an error by type, gradation, density, and temperature of soil. This study shows the laboratory calibration test using TDR CS616, TDR-P3, TDR-T3. The calibration equations of TDR were then proposed. It was confirmed from the study that the data of TDR probe monitored in field could be used to estimate the freezing, unfrozen water content, and matric suction of soil.

Keywords
Water content calibration
Water supply line
Time-domain reflectometry (TDR)
Volume water content
CS616

지하매설구조물인 상수도관 주변 지반의 간극수 동결로 상수도관의 변형에 영향을 미칠 수 있다. 이에 최근에는 현장 계측을 통한 포장 하부구조체의 함수비를 주기적으로 측정하기 위해서 미국 Campbell사의 TDR(time domain reflectometry) CS616 함수량계와 독일의 IMKO사 제품의 TRIME FM를 이용한 수동 함수량계 TRIME P3, T3 Probe를 사용하고 있다. 일반적으로 TDR 함수량계와 TRIME 수동 함수량계는 흙의 종류, 입도, 다짐도, 온도 등에 의해 오차가 유발될 수 있기 때문에, 현장의 시료를 사용하여 TDR 함수량계의 실내보정실험을 반드시 수행해야 한다. 즉, TDR함수량계의 매뉴얼에서는 일반적인 흙의 보정방정식을 제안하고 있지만 현장 적용시에는 반드시 보정실험을 수행하도록 권고하고 있다. 본 연구에서는 상수관 등 지하매설구조물의 주변의 다양한 채움재료를 사용하여 실내 보정 실험을 수행하였으며, 이 결과로부터 TDR함수량계인 CS616, TRIME-T3, TRIME-P3의 보정모델식을 제안하였으며, 보정식에 대한 현장검증을 수행하였다.

References
1
1.Kim, B. I. and Jeon S. I. (2005), “Development of Calibration Model and Analysis of Soil Water Content using Time - Domain Refelctometry Probe in LTPP Sections”, Journal of the Korean Society Road Engineers, Vol.7, No.4, pp.103-112.
2
2.Brian, K. D., Imad, L. A., and Amara Loulizi (2000), “Laboratory Calibration and Field Verification of Soil Moisture Content Using Two Types of Time-Domain Reflectometry Probes”, TRB 79th Annual Meeting, No. 001027.
3
3.Davis, J. L. and Chudobiak, W. J. (1975), “In-Situ Meter for Measur-ing Relative Permittivity of Soil,” Geol. Surv. Can. Pap, Vol.75-1A, 75-79.
4
4.Hossain, M., Kotdwala, S. J., Long, B. and Gisi, A. J. (1997), “Subgrade Moisture Monitoring Using Time Domain Reflecto-metry,” Transportation Research Board 76th Annual Meeting.
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5.Jiang, Y. J. and Tayabji, S. D. (1999), “Evaluation of In-Situ Moisture Content at LTPP Seasonal Monitoring Program Sites,” TRB 78th Annual Meeting, No. 990395.
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6.Topp, G. C., Davis, J. L. and Annan, A. P. (1980), “E1ectro-magnetic Determination of Soil Water Content: Measurements in Coaxial Transmission Lines,” Water Resources Research, Vol.16, No.3, pp.574-582.
7
7.Topp, G. C. and Davis, J. L. (1985), Time Domain Reflectometry (TDR) and Its Application to Irrigation Scheduling, In Advances in Irrigation, Vol.3, Daniel Hilled(ed), Academic.
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8.Va1dez, S. F. (1991), Subgrade Resilient Modulus Evaluation, FHWA-GA–91-8801.
Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 12
  • No :2
  • Pages :1-11
  • Received Date : 2013-03-15
  • Revised Date : 2013-04-07
  • Accepted Date : 2013-04-09
  • DOI :https://doi.org/10.12814/jkgss.2013.12.2.001
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