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제주도 북서부 및 남동부 현무암의 물리적 & 역학적 특성

Physical and Mechanical Characteristics of Basalts in Northwestern and Southeastern Jeju Island

초록

제주도 화산암은 여러 환경적인 요인으로 인하여 크기와 분포가 다양한 기공이 많은 다공성 구조를 보이고 있으며, 지질학적 그리고 역학적 특성 또한 지역마다 차이를 나타내고 있다. 뿐만 아니라, 제주도의 기반암은 여러 차례의 화산활동으로 인해 현무암층 사이에 연약층인 화산쇄설물 및 공동이 불규칙하게 발달된 층상구조로 이루어져 있다. 본 연구에서는 제주도 북서부 육 해상에서 채취한 현무암 암석에 대하여 다양한 물성 시험 및 일축압축강도 시험을 수행하고, 그 결과를 제주도 남동부 해상에서 채취한 현무암 암석의 물리적, 역학적 특성과 비교 분석하였다. 그 결과 제주도 북서부 육 해상에서 채취한 현무암 암석의 물리, 역학적 특성은 제주도 남동부 해상에서 채취한 현무암 암석과 유사한 관계에 있음을 확인할 수 있었으며, 물리적 특성과 역학적 특성의 상관관계로부터 대략적인 설계정수를 추정할 수 있었다.

Abstract

Volcanic rocks in Jeju Island have vesicular structure caused by various environmental factors, and indicate the differences in geological and mechanical characteristics from region to region. In addition, the bedrock of Jeju Island shows stratified structure, that is, soft layers composed of pyroclastic rocks or cavities are irregularly developed between the basalt layers by several times of volcanic activity. In this study, various physical tests and unconfined compressive strength test were conducted for intact rocks sampled in northwestern onshore and offshore of Jeju Island. The results obtained in the tests were compared with the physical and mechanical characteristics of intact rocks sampled in southeastern offshore of Jeju Island. As a results, it was confirmed that the physical and mechanical characteristics of basalts sampled in northwestern Jeju Island were similar to those of basalts sampled in southeastern offshore of Jeju Island. In addition, it was possible to estimate approximate design parameters from the correlation of mechanical properties with physical properties of basalts in Jeju Island.

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