KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
권호 표지

Effects of Water Content and Pore Water Contamination on Electrical Resistivity of Unsaturated Sand

함수비와 간극수 오염이 불포화 사질토의 전기비저항에 미치는 영향

Oh, Myoung-Hak;Lee, Ki-Ho;Park, Jun-Boum
오명학;이기호;박준범

  • Published : 2004.01.31

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Abstract

Laboratory experiments were performed to evaluate the effect of water content and pore water contamination on electrical resistivity of unsaturated sand. The electrical resistivity of unsaturated sand decreased, as gravimetric water content or dry unit weight increased. Electrical resistivity can be expressed as a function of volumetric water content, which reflects the effects of gravimetric water content and compaction degree. As volumetric water content increased, electrical resistivity exponentially decreased. Since volumetric water content can be expressed as porosity times degree of saturation, the regression equation is similar in its formation with the Archie's equation which is for saturated sand. The electrical resistivity of soil also decreased by the addition of landfill leachate. These results indicate that electrical resistivity measurements method has a potential in the evaluation of pore water contamination.

수분함량과 간극수의 오염에 의한 불포화 사질토 지반의 전기비저항의 변화를 평가하기 위하여 실내실험을 수행하였다. 불포화 사질토의 전기비저항은 함수비나 건조단위중량이 증가함에 따라 감소하는 경향을 나타내었다. 함수비의 증가에 의한 전기비저항 감소와 다짐정도의 증가에 의한 간극수의 연결성 증가에 의한 전기비저항 감소를 모두 반영한 인자로 체적함수비를 도입하였으며, 불포화 사질토 지반의 전기비저항은 체적함수비의 증가에 따라 지수함수적으로 감소하는 함수관계를 나타내었다. 체적함수비는 간극률과 포화도의 곱으로 표현되므로 체적함수비와 전기비저항과의 상관관계식은 포화 사질토 지반에 적용되는 Archie식에 포화도가 추가된 형태의 식으로 나타낼 수 있었다. 이온성 물질들을 많이 포함하고 있는 침출수에 의한 간극수의 오염은 지반의 전기비저항 감소를 유발하였다. 이 결과에 의하면 지반의 전기비저항 측정에 의하여 간극수의 오염도 평가가 가능함을 알 수 있다.

Keywords

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