남극 세종기지의 기후 환경을 모사한 암석의 동결-융해 풍화 시험
Freeze-Thaw Cycle Test on Rocks for the Simulated Environment of the King Sejong Station, Antarctica
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초록
극지환경이나 고지대 환경 등 저온환경에서 발생되는 동결-융해에 의한 물리적 풍화작용을 실내 인공풍화 장치를 이용해 실험적으로 재현하였다. 이를 위해 남극 세종기지 주변의 암종인 섬록암과 현무암, 응회암을 실험 대상으로 선정하였다. 온도 조건은 남극 세종기지 주변의 기온과 지중온도를 고려하였고, 수분 조건은 상온건조상태와 완전포화상태에서 실험을 수행하였다. 건조 및 포화시료에 대한 일축압축시험을 수행하고 주사전자현미경(SEM) 영상을 취득하여 암석의 동결-융해 풍화작용에 수분이 미치는 영향을 조사하였다. 일축압축시험 결과 포화시료의 강도가 더 낮게 측정되었고, 주사전자현미경 영상을 통해 수분이 미세균열의 발달에 영향을 미치는 것이 관찰되었다.
Abstract
Physical weathering caused by freeze-thaw action in cold regions such as polar regions and high altitude regions was simulated with artificial weathering simulator in laboratory. Diorite, basalt and tuff specimens were prepared, which are the same as the rock type around Sejong Station, Antarctica. Temperature conditions were set up with the consideration of air and ground temperatures around Sejong Station, Antarctica. The test was carried out under two conditions: dried conditions at room temperature and saturated conditions. Uniaxial compression tests were conducted for the specimens which were separately weathered in dried and saturated conditions. Scanning electron microscopy (SEM) photographs of diorite, basalt and tuff were also acquired to investigate the role of water in physical weathering processes. In uniaxial compression test, the strength of the specimens which were weathered in saturated conditions was measured to have lower strength than in dried conditions. In SEM photographs, it was observed that water develops microcracks in rock specimens.
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