Browse > Article
http://dx.doi.org/10.9720/kseg.2021.3.333

Analysis of Sand Water Ratio and Drying Unit Weight Using Flat TDR System  

Lee, Junesung (Department of Civil Engineering, Chosun University)
Kim, Daehyeon (Department of Civil Engineering, Chosun University)
Publication Information
The Journal of Engineering Geology / v.31, no.3, 2021 , pp. 333-342 More about this Journal
Abstract
In this study was conducted to measure the water content and dry unit weight of the ground using TDR (Time Domain Reflectometry) in order to supplement the problems of the conventional compaction management method. The Flat TDR system is a device that does not cause ground disturbance, and in order to verify the measured values, the dry density and water content were measured for samples of the ground subject at 7 sites other than Jumunjin Standard Temple. The water content section was divided into 6 sections of 3, 6, 9, 12, 15, and 18%, and the experimental results were confirmed according to the unified classification method. As a result of the indoor experiment, the water content showed an error of about 0.7% for the SP sample and about 1.3% for the SM sample. In addition, the dry unit weight confirmed an error of about 7% for the SP sample and about 5% for the SM sample. It was confirmed that stable values were derived in sandy or silty sandy ground except for clay or gravel. Through the experimental results, it was confirmed that the measured values of the flat TDR system derive similar values to the existing traditional compaction management method, and it was determined that the flat TDR equipment was suitable for construction sites that require quick constructability and economic feasibility.
Keywords
TDR; flat TDR; compaction test; water ratio; drying unit weight;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Song, M.W., 2016, Development of nondestructive measurement system for estimating geotechnical properties of soils, Master Thesis, Chosun University, 1-118 (in Korean with English abstract).
2 Song, M.W., Kim, D.H., Choi, C.Y., 2015, A new calibration equation for predicting water contents with TDR, Journal of the Korean Geosynthetics Society, 14(1), 59-65 (in Korean with English abstract).   DOI
3 Thring, L.M., Boddice, D., Metje, N., Curioni, G., Chapman, D.N., Pring, L., 2014, Factors affecting soil permittivity and proposals to obtain gravimetric water content from time domain reflectometry measurements, Canadian Geotechnical Journal, 51(11), 1303-1317.   DOI
4 Topp, G.C., Davis, J.L., Annan, A.P., 1980, Electromagnetic determination of soil water content: measurements in coaxial transmission lines, Water Resources Research, 16(3), 574-582.   DOI
5 Yu, X., Yu, X., 2006, Time domain reflectometry tests of multilayered soils, Proc. TDR, Purdue University, 1-16.
6 Giese, K., Tiemann, R., 1975, Determination of the complex permittivity from thin-sample time domain reflectometry improved analysis of the step response waveform, Advances in Molecular Relaxation Processes, 7(1), 45-59.   DOI
7 Siddiqui, S.I., Drnevich, V.P., Deschamps, R.J., 2000, Time Domain 1. Reflectometry development for use in geotechnical engineering, Geotechnical Testing Journal, 23(1), 99-20.
8 Yu, X., Drnevich, V.P., 2004, Soil water content and dry density by time domain reflectometry, Journal of Geotechnical and Geoenvironmental Engineering, 130(9), 922-934.   DOI
9 Song, M.W., Choi, C.Y., Kim, D.H., 2016, Development of a flat-type TDR system for compaction control, Journal of the Korean Geotechnical Society, 32(4), 51-61 (in Korean with English abstract).   DOI
10 ASTM D6780-05, 2005, Standard test method for water content and density of soil in place by time domain reflectometry (TDR), Annual Book of ASTM Standards.
11 Ferre, P.A., Knight, J.H., Rudolph, D.L., Kachanoski, R.G., 1998, The sample areas of conventional and alternative time domain reflectometry probes, Water Resources Research, 34(11), 2971-2979.   DOI
12 Jung, S., Drnevich, V., Abounajm, M., 2013, New methodology for density and water content by time domain reflectometry, Journal of Geotechnical and Geoenvironmental Engineering, 139(5), 659-670.   DOI
13 Knight, J.H., Ferre, P.A., Rudolph, D.L., Kachanoski, R.G., 1997, A numerical analysis of the effects of coatings and gaps upon relative dielectric permittivity measurement with time domain reflectometry, Water Resources Research, 33(6), 1455-1460.   DOI
14 Sallam, A.M., White, N.K., Ashmawy, A.K., 2004, Evaluation of the purdue TDR method for soil water content and density measurement, No. BC-353-30.