한국지반공학회논문집 (Journal of the Korean Geotechnical Society)

한국지반공학회 (Korean Geotechnical Society)
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제주도 현무암의 점착력과 내부 마찰각

Cohesion and Internal Friction Angle of Basalts in Jeju Island

  • 양순보 (일본 국립연구개발법인 항만공항기술연구소)
  • Yang, Soon-Bo (Port and Airport Research Institute, National Research and Development Agency)
  • 투고 : 2015.08.05
  • 심사 : 2015.09.24
  • 발행 : 2015.11.30
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초록

제주도 화산암은 지질학적 그리고 역학적 특성이 지역마다 큰 차이를 보일 뿐만 아니라, 특히 여러 환경적인 요인으로 인하여 크기와 분포가 다양한 기공이 많은 다공성 구조를 보이고 있다. 본 연구에서는 제주도 북동부 육해상, 남동부 해상 및 북서부 해상에서 채취한 현무암 암석에 대하여 삼축압축시험을 수행하였으며, 그 결과로부터 추정된 점착력과 내부 마찰각을 제주도 현무암의 다공성 구조를 나타내는 파라미터인 흡수율과 비교 분석하였다. 그 결과 제주도 현무암의 흡수율과 점착력의 관계는 흡수율과 비중의 상관관계에 따라 그 관계를 명확하게 구분할 수 있었으며, 흡수율이 증가함에 따라 점착력은 급격하게 감소하였다. 반면 제주도 현무암의 내부 마찰각은 흡수율과 비중의 상관관계와 관계없이 흡수율이 증가함에 따라 거의 선형적으로 감소하였다.

Volcanic rocks in Jeju Island indicate the differences in geological and mechanical characteristics from region to region, and have vesicular structure caused by various environmental factors. In this study, triaxial compressive strength tests were conducted for intact rocks sampled in northeastern onshore and offshore, southeastern offshore and northwestern offshore of Jeju Island. The estimated cohesion and internal friction angle from the results of triaxial compression tests were compared and analyzed with absorption, a parameter representing the vesicular properties of basalts in Jeju Island. As a result, it was found that the relationship between cohesion and absorption could be classified clearly, considering two different linear relationships in bulk specific gravity and absorption. As the absorption increases, the cohesion decreases exponentially. In addition, the internal friction angle decreases almost linearly with increasing in the absorption, regardless of the relationships in bulk specific gravity and absorption.

키워드

참고문헌

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피인용 문헌

  1. 암반의 파괴기준에 따른 제주도 현무암의 강도정수 vol.32, pp.3, 2015, https://doi.org/10.7843/kgs.2016.32.3.15
  2. 제주도 북동부 및 북서부 현무암반의 변형계수 추정 vol.35, pp.1, 2015, https://doi.org/10.7843/kgs.2019.35.1.5
  3. 제주도 화산암의 압열인장강도와 일축압축강도로부터 추정된 점착력과 내부마찰각 vol.36, pp.2, 2015, https://doi.org/10.7843/kgs.2020.36.2.17
  4. 함수상태에 따른 제주도 현무암의 역학적 특성 vol.36, pp.7, 2015, https://doi.org/10.7843/kgs.2020.36.7.29