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NTIS 바로가기대한토목학회논문집 = Journal of the Korean Society of Civil Engineers, v.33 no.3, 2013년, pp.1063 - 1075
박정희 (고려대학교 건축사회환경공학부) , 강민구 (고려대학교 건축사회환경공학부) , 이종섭 (고려대학교 건축사회환경공학부)
The strength of frozen soils is one of the significant design parameters for the construction in frozen ground. The properties of frozen soils should be investigated to understand the strength of frozen soils. The objective of this study is to figure out the characteristics of elastic waves in froze...
핵심어 | 질문 | 논문에서 추출한 답변 |
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액침법의 측정방법은? | 2006; Christ and Park, 2009). 액침법은 저온의 온도(≈-20℃)로 동결된 시료를 등유로 채운 수조에 넣은 후, 동결된 시료를 녹이면서 탄성파 속도만을 측정한다. 여기서 동결토의 압축파 속도는 압축파 트랜스듀서를 이용하여 직접 측정되지만 동결된 시료의 전단파 속도는 모드변환(mode conversion)의 원리를 이용하여 간접적으로 측정된다. | |
탄성파를 적용할 수 있는 분야는? | 1988; Rose, 1999)이다. 탄성파를 이용하여 연약지반의 탄성계수 및 간극비 평가, 흙의 특성연구, 록볼트의 건전도 평가, 지반내의 불연속 물질 탐측등과 같이 탄성파의 적용분야는 점점 확대되고 있다(Yoon et al. 2010; Cho and Santamarina, 2001; 유정동 등. | |
액침법을 이용한 동결토의 탄성파 특성 파악의 한계는? | 액침법을 이용한 동결토의 탄성파 특성 파악은 다음과 같은 한계를 보여준다. 첫째, 시료를 등유 속에 넣고 탄성파를 측정하기 때문에 시료의 자립을 위해서 시료를 저온으로 얼린 후, 녹이면서 탄성파를 측정해야 한다. 둘째, 등유 속의 시료는 표면부터 녹기 때문에 시료의 자립이 어려워지는 0℃ 근처에서의 탄성파 속도를 산정할 수 없다. 마지막으로 속도, 주파수 및 진폭으로 구성되는 탄성파의 특성 중 동결토의 탄성파 속도만을 파악할 수 있다. |
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