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Journal of the Korean Society of Hazard Mitigation 2012;12(3):115-122.
Published online June 30, 2012.
흙의 입도분포 특성을 고려한 습윤구간 함수특성곡선 예측
임병권, 김윤태
Prediction of Adsorptive Soil Water Characteristic Curve considering Grain-size Distribution
Byung-Gwon Lim, Yun-Tae Kim
Abstract
Natural slope failure triggered by rainfall usually occurs due to loss of shear strength, which induced by increasing water content from rainfall infiltration. Therefore, adsorptive curve of SWCC is more suitable than desorptive curve for predicting behaviors of real slope. It regards as an important unsaturated property. To obtain a SWCC is not only costly and time consuming but also difficult to estimate due to uncertainty of natural soil. In this paper, a simple prediction method was proposed using Arya & Paris model and grain-size distribution curve to predict adsorptive SWCC in three weathered granite soils of Korea. Two fitting parameters were also proposed to improve applicability to weathered granite soils in Korea. The predicted results were compared with the experimental results. From results, the proposed method using Arya & Paris model, grain-size distribution curve, $D_{10}$ and $D_{30}$ could be applicable to predict adsorptive SWCC of weathered granite soil in Korea.
Key Words: Pedo transfer function; Adsorption soil water characteristic curve; Hysteresis; Arya & Paris model
요지
일반적으로 자연사면붕괴는 강우에 의해 함수비가 증가함에 따라 전단강도가 상실되어 발생한다. 그러므로 습윤과정의 함수특성곡선이 강우 시 실제 사면거동 특성과 더 잘 부합되며, 사면안정해석 시 불포화 지반정수로서 중요하게 간주된다. 함수특성곡선 산정은 시간과 비용이 많이 소요되고, 흙의 불확실성에 때문에 정확한 결과를 도출해 내기 힘든 실정이다. 따라서 본 연구에서는 국내 화강풍화토 3개 지역의 입도분포곡선과 Arya & Paris 모델을 활용하여 습윤과정 함수특성곡선을 쉽게 추정할 수 있는 방법을 제안하였으며, 국내 화강풍화토에 대한 적용성을 높이기 위해 보정함수를 제시하였다. 궁극적으로 Arya & Paris 모델, 입도분포곡선, $D_{10}$$D_{30}$을 이용하여 국내 화강풍화토의 습윤구간 함수특성곡선을 추정할 수 있는 간편한 방법을 제안하였다.
핵심용어: 토질변환함수; 습윤구간 함수특성곡선; 이력현상; Arya & Paris 모델


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