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Journal of the Korean Society of Hazard Mitigation 2012;12(3):109-114.
Published online June 30, 2012.
점토지반의 기본물성과 압밀특성의 평가
이승현, 윤찬영
Estimation of Basic Properties and Consolidation Characteristics of Clay
Seung Hyun Lee, Chan-Young Yune
Abstract
Estimation of basic soil properties and consolidation characteristics obtained from laboratory tests for clay samples was conducted. Comparing the measured unit weight of clay and initial void ratio with those computed by phase relationship, there was little difference in unit weight whereas there was large difference in initial void ratio. Comparing compression index obtained from consolidation test with that predicted by equations, it could be seen that Azzouz method showed high reliability and Nagaraj method gave conservative results. There were large differences in the degree of consolidation between the justified degree of consolidation based on natural water content and Atterberg limits and that obtained from the consolidation tests. It is thought that predicted preconsolidation pressure by US NAVY prediction equation is available in order to minimize the gap.
Key Words: Estimation; Basic soil properties; Consolidation characteristics; Clay sample
요지
점토지반에서 채취한 시료에 대한 실내시험으로부터 얻은 기본물성과 압밀특성자료를 비교분석해 보았다. 측정을 통해 구한 단위중량과 압밀시험을 통해 얻은 원지반 간극비를 흙의 상관관계식에 의한 값과 비교해 보았는데 단위중량에 있어서 큰 차이는 없었으나 원지반 간극비에 있어 큰 차이가 있었다. 압밀시험에 의한 압축지수와 다양한 예측식에 의한 압축지수를 비교해 보았는데 Azzouz 방법의 신뢰성이 높았으며 Nagaraj 방법이 보수적인 값을 주었다. 함수비와 아터버그한계에 근거한 압밀정도의 평가결과와 압밀시험을 통해 얻은 평가결과 사이에 있어 큰 차이가 있었는데 그 차이를 해소할 방안으로 US NAVY 방법으로 추정한 선행압밀압력을 적용할 수 있을 것으로 판단된다.
핵심용어: 평가; 기본물성; 압밀특성; 점토지반


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