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2016 Vol.32, Issue 3 Preview Page
Strength Parameters of Basalts in Jeju Island according to Rock Failure Criterions

암반의 파괴기준에 따른 제주도 현무암의 강도정수

Soon-Bo Yang1*
양 순보1*
1Member, Researcher, Port and Airport Research Institute, National Research and Development Agency
1일본 국립연구개발법인 항만공항기술연구소 연구관
*교신저자. *Corresponding Author. 
31 March 2016. pp. 15-27
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Abstract

In this study, a series of triaxial compressive strength tests were conducted for basaltic intact rocks sampled in the northeastern onshore and offshore, southeastern offshore and northwestern offshore of Jeju Island. Hoek-Brown constants were estimated from the results of the triaxial compression tests, and the properties of the Hoek-Brown constants were investigated. In addition, the cohesion and internal friction angle, strength parameters of Mohr-Coulomb failure criterion, obtained from the results of the triaxial compression tests were compared and analyzed with those estimated from Hoek-Brown failure criterion, respectively. As results, it was found that the Hoek-Brown constant is deeply related to the internal friction angle. As the internal friction grows, the Hoek-Brown constant increases exponentially. The cohesions estimated from the Hoek-Brown failure criterion, on average, are approximately 24% higher than those obtained from the Mohr-Coulomb failure criterion. The internal friction angles estimated from the Hoek-Brown failure criterion are similar to those obtained from the Mohr-Coulomb failure criterion.

Keywords
Jeju Island, Basalts
Mohr-Coulomb failure criterion
Hoek-Brown failure criterion
Hoek-Brown constant
Cohesion
Internal friction angle

본 연구에서는 제주도 북동부 육해상, 남동부 해상 및 북서부 해상에서 채취한 현무암 암석에 대하여 삼축압축시험을 수행하였으며, 그 결과로부터 산정된 Hoek-Brown 파괴기준의 파라미터인 암석 계수 의 특성을 살펴보았다. 그리고 Hoek-Brown 파괴기준으로부터 추정된 점착력 및 내부 마찰각과 Mohr-Coulomb 파괴기준으로부터 산정된 점착력 및 내부 마찰각을 각각 비교･분석하였다. 그 결과 제주도 현무암 암석에 대한 Hoek-Brown 파괴기준의 암석 계수 는 암석의 내부 마찰각과 밀접하게 연관되어 있었으며, 내부 마찰각이 증가함에 따라 급격하게 증가하였다. Hoek-Brown 파괴기준으로부터 추정된 점착력은 Mohr-Coulomb 파괴기준으로부터 산정된 점착력보다 평균적으로 약 24% 정도 과대하게 추정되고 있으며, Hoek-Brown 파괴기준으로부터 추정된 내부 마찰각은 Mohr-Coulomb 파괴기준의 내부 마찰각과 비슷한 값을 나타내고 있음을 알 수 있었다..

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 32
  • No :3
  • Pages :15-27
  • Received Date : 2015-12-19
  • Revised Date : 2016-01-25
  • Accepted Date : 2016-02-01
  • DOI :https://doi.org/10.7843/kgs.2016.32.3.15
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