Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
권호 표지
DOI QR코드

DOI QR Code

Cohesion and Internal Friction Angle of Basalts in Jeju Island

제주도 현무암의 점착력과 내부 마찰각

  • Yang, Soon-Bo (Port and Airport Research Institute, National Research and Development Agency)
  • 양순보 (일본 국립연구개발법인 항만공항기술연구소)
  • Received : 2015.08.05
  • Accepted : 2015.09.24
  • Published : 2015.11.30
Download PDF
⟨ Previous Next ⟩

Abstract

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.

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.

Keywords

References

  1. ASTM D 7012-13, Standard Test Method for Compressive Strength and Elastic Moduli of Intact Rock Core Specimens under Varying States of Stress and Temperatures, ASTM International.
  2. Cho, T.C., Lee, S.B., Hwang, T.J., and Won, K.S. (2009), "Variations of Mechanical Properties of Hallasan Trachyte with Respect to the Degree of Weathering", Tunnel and Underground Space, Vol.19, No.4, pp.287-303.
  3. Eum, K.Y. (2002), Study on the Mechanical Properties of Volcanic Rocks in Chejudo, Master thesis, Yonsei University, p.63.
  4. GK Engineering, JPM Inc., and Jeju National Univ. (2013), Report of the Leading Industry of Jeju Economic Region.
  5. GK Engineering, JPM Inc., and Jeju National Univ. (2014), Report of the Leading Industry of Jeju Economic Region.
  6. GK Engineering, JPM Inc., and Jeju National Univ. (2015), Report of the Leading Industry of Jeju Economic Region.
  7. Kim, J.H. (2006), A Study on the Mechanical Characteristics and the Strength in Pyoseonri Basalt, Master thesis, Cheju National University, p.93.
  8. Kim, Y.K. and Choi, O.G. (1991), "Engineering Geological Characteristics of Volcanic Rocks of the Northwestern Cheju Island, Korea", The Journal of Engineering Geology, Vol.1, No.1, pp.19-37.
  9. Korean Geotechnical Society (2012), Geology and Rock Mechanics for Geotechnical Engineer II, CIR Publishing Company, p.735.
  10. Korean Society for Rock Mechanics (2005), Standard method for sampling and preparation of rock specimen, pp.81-84.
  11. Moon, K., Park, S., Kim, Y., and Yang, S. (2014), "Mechanical Properties of Basalt in Jeju Island with Respect to Porosity", Journal of the Korean Society of Civil Engineering, Vol.34, No.4, pp.1215-1225. https://doi.org/10.12652/Ksce.2014.34.4.1215
  12. Nam, J.M., Yun, J.M., Song, Y.S., and Kim, J.H. (2008a), "Analysis of Engineering Properties to Basalt in Cheju Island", Journal of Korean Geosynthetics Society, Vol.7, No.1, pp.12-21.
  13. Nam, J.M., Yun, J.M., Song, Y.S., and Kim, J.H. (2008b), "Analysis of Influence Factors to Compressive and Tensile Strength of Basalt in Cheju Island", The Journal of Engineering Geology, Vol.18, No.2, pp.215-225.
  14. Nam, J.M., Yun, J.M., and Song, Y.S. (2009), "Estimation to the Strength of Basalt in Jeju Island according to Rock Failure Criterions", The Journal of Engineering Geology, Vol.19, No.2, pp.153-163.
  15. Yang, S.B. (2014), "Comparative Study on Physical and Mechanical Characteristics of Volcanic Rocks in Jeju Island", Journal of the Korean Geotechnical Society, Vol.30, No.11, pp.39-49. https://doi.org/10.7843/kgs.2014.30.11.39
  16. Yang, S.B. (2015), "Physical and Mechanical Characteristics of Basalts in Northwestern and Southeastern Jeju Island", Journal of the Korean Geotechnical Society, Vol.31, No.7, pp.41-52. https://doi.org/10.7843/kgs.2015.31.7.41
  17. Yoon, S.H. and Ko, K.W. (2011), Topography, Geology and Underground Water in Jeju Island, Nae Ha Publishing Company, p.130.

Cited by

  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