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사질토 간극수의 이온 성분들에 따른 전기비저항값의 변화
유찬,윤춘경,이영남,이용길,Yu, Chan,Yoon, Chun-Gyeong,Lee, Young-Nam,Lee, Yong-Gil 한국지반공학회 1999 한국지반공학회논문집 Vol.15 No.1
실내실험에 의하여 사질토 간극수의 이온 성분들사이 관계를 규명하기 위하여 흙의 비저항측정 상자와 STING-Rl비저항 측정기를 이용하여 분석을 수행하였다. 실험은 이온성분들의 농도를 변화시키면서 실시하였다. 또한 2~3가지 성분을 혼합한 경우에 대해서도 비저항값의 변화를 측정하였다. 실험결과는 성분중에서 비소(As)의 비저항값의 감소가 가장 컸으며, 나머지 성분들은 일반성분들과 큰 차이를 보이지는 않았다. 또한 혼합성분의 경우에는 비저항값의 범위가 간극수에 포함된 성분들의 비저항값에 따라 달라지는 것으로 나타났다. A laboratory experiment was performed to examine the relationship between resistivity and ionic components in the pore water of a sand by using soil resistivity test box and STING-Rl. The resistivity measurement was performed with the concentration changes of ionic components. Also, the resistivity change was evaluated for multiple components. The results showed that the resistivity of Arsenic was less than other heavy metals. In the case of complex components, resistivity ranges depended on the resistivity of components existed in the pore water.
윤춘경 ( Yoon Chun Gyeong ),유찬 ( Yu Chan ),김경한 ( Kim Kyoung Han ) 한국농공학회 1999 韓國農工學會誌 : 전원과 자원 Vol.41 No.1
Laboratory experiment was performed for the TDR to measure the soil moisture, and the results, were compared with the design water content and the one measured by oven-try method. Sand and kaolinite were used. Variables for the experiment were water content (10~50%), void ration (0.7~1.3), mixture rate of kaolinite (10~30%), and measurement methods (TDR and oven-dry). In all cases, TDR method showed very accurate and reliable results, and average error and error range were far less than the oven-dry method which is widely used. Considerable error was noticed when water content was 50% where saturation was achieved for both methods. Therefore, TDR was thought to be applicable to the field moisture measurement if it is unsaturated. For field scale application of TDR, more research and verification of the accuracy with diverse soil conditions including physical, chemical and mineral properties are recommended.
침출수로 오염된 불포화사질토의 전기비저항 변화에 대한 연구
윤춘경 ( Yoon Chun Gyeong ),유찬 ( Yoo Chan ) 한국농공학회 1998 韓國農工學會誌 : 전원과 자원 Vol.40 No.2
Measurement of electrical resistivity in soils has been used for many years with purpose of estimating in situ porosity or density. Recently electrical resistivity has also been used as an indicator of soil contaimination. This paper presents the result of laboratory experiment to investigate the resistivity variation in contaminated sandy soils. The results can be used with the Cone Penetrometer Test (CPT) result to analyse ground condition. In the experiment, the water content and leachate concentration of soils were controlled by groundwater and leachate, and then the resistivity measurement was made with 'STING-R1' by Advanced Geosciences Inc. In the case of using groundwater, the resistivity was in the range of over 1000·Ωm, but in the case of using polluted water by leachate, the resistivity decreased significantly down to 10~100·Ωm for the same moisture content. Also the resistivity varied according to the degree of saturatrion. Therefore, if soil is contaminated by leachate, the CPT with electrical resistivity sensor might be used to investigate the contamination status and plume migration. But exact component of leachate and the pollutant concentration are still hard to identify.
흙의 구성광물과 간극수의 성분이 비저항값에 미치는 영향에 관한 연구
윤춘경,유찬,윤길림 한국환경농학회 1998 한국환경농학회지 Vol.17 No.1
The environmental problem of the rural area has been accelerated in soil as well as water. Soil contamination is usually caused by improper operation of landfills, abandoned mine fields, accidental spills, and illegal dumpings. Once soil contamination is initiated, pollutants migrate and may cause groundwater contamination which takes much effort for remediation. Early detection, therefore, is important to prevent further contamination. Electrical resistivity method was used to detect soil contamination, but it was not effective to the heterogeneous condition. Static cone penetrometer test (CPT) has been used widely to investigate geotechnical properties of the underground. In this study, electrical resistivity method and CPT are combined to improve the applicability of it. The pilot test was performed to examine the variation of electrical resistivity with different soil minerals and pore fluid characteristics. Soil samples used were poorly graded sand, silty sandy soil, and weathered granite soil. For all the cases, electrical resistivity decreased with increasing of moisture content. Soil mineral also affected the electrical resistivity significantly. Above all, leachate addition in the pore fluid was very sensitive and caused decreasing of electrical resistivity markedly. It implies that electrical resistivity method can be applied to investigate pollutant plume effectively. This is specially sure when the sensors contact the contaminated soils directly. The CPT method involves cone penetration to the ground, therefore, underground contamination around the cone could be investigated effectively even for heterogeneous condition as it penetrates if electrical resistivity sensors are attached on the cone.