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Journal of the Korean Society of Hazard Mitigation 2011;11(4):131-136.
Published online August 31, 2011.
하중속도 및 수분포화가 암석의 파괴인성에 미치는 영향
정우진
Effects of Loading Rate and Water Saturation on the Fracture Toughness of Rocks
Woo-Jin Jung
Abstract
The fracture toughness of rock was measured by Chevron bend Tests. In order to make sure the effects of loading rate and water saturation on the fracture toughness of rocks, Chevron bend tests under static and impact loading using three different types of rocks in both saturated and dry states. In the Impact loading test, the loading rate was adjusted by changing the drop-height of a drop hammer. the testing results showed that dynamic fracture toughness of rocks increased significantly with increasing loading rates. Water saturation induced a substantial decrease in both the dynamic and static fracture toughness of Tage tuff, while we could no significant difference between dynamic and static fracture toughness for Kimachi sandstone and Inada granite between dry and saturated states.
Key Words: rock; fracture toughness; impact loading; water saturation; loading rate
요지
본 연구에서는 하중속도 및 수분포화가 암석의 파괴인성에 미치는 영향을 파악하기 위하여, 건조 및 수분포화상태의 3종류의 암석을 대상으로 정적 및 충격하중하에서 세브론 휨시험(CB시험)을 실시하였다. 충격하중 시험에서의 하중속도는 충격추의 높이를 변화시켜 조절하였다. 시험결과, 암석의 동적파괴인성은 하중속도가 증가됨에 따라 비교적 크게 증가하였다. 수분포화의 영향으로 응회암의 동적파괴인성은 크게 감소하였으나, 사암과 화강암은 건조상태와 포화상태와의 사이에 유의한 차이는 없었다.
핵심용어: 암석; 파괴인성; 충격하중; 수분포화; 하중속도


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