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2007 Vol.44, Issue 2
Estimation of Stress Deformation History and Fault Types in Fault Zone, Weolseong Area

월성지역 단층대에서 응력 변형사 및 단층 형태 예측

강성승, 윤건신, 김영석, 김정빈

Seong-Seung Kang, Kern-Shin Yoon, Young-Seog Kim and Cheong-Bin Kim

30 April 2007. pp. 95-106
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Abstract
This study is focused on defining the stress deformation history and the capable fault type under the stress state in a fault zone, Weolseong area, using calcite twin, healed microcrack, hydraulic fracturing test. From the average twin strain, thickness and intensity, and the appearance of twins, it is estimated that calcite twins were produced under temperatures approximately lower than 70 ℃. The maximum shortening axis obtained from twins in calcite veins was oriented in NNE-SSW, and the fault type estimated from the stress states of calcite twins is a normal fault. The maximum horizontal stress determined from healed microcracks in quartz was dominantly oriented in NE-SW. Comparing the results of paleostress from calcite twins and healed microcracks and those obtained from previous studies, it is suggested that paleostress was applied to NNE-SSW or NE-SW direction in the late Oligocene to the early Miocene. In addition, the magnitudes of vertical, maximum and minimum horizontal stresses calculated by a hydraulic fracturing test were σv=1.121 MPa, σh=2.800 MPa, σH=3.187 MPa, respectively. It means that these stress states are related with a thrust fault. The calculated average stress ration (Kave) is 2.670, the tensile strength (σT) is 4.267 MPa, and the maximum horizontal stress was oriented in 163.5° (NNW-SSE) from the true north. Considering the directions of stress fields obtained from above three methods, it is suggested that the state of stress in the study area might be changed from NNE-SSW or NE-SW in the past to NNW-SSE in the present.
Keywords
Calcite twin
Healed microcrack
Hydraulic fracturing test
Stress deformation history
Stress state
본 연구는 단층대가 관찰되는 월성지역에 대해 방해석 쌍정, 아문미세균열, 수압파쇄시험 등을 이용하여 연구지역에 대한 응력의 변형사와 응력상태하에서 발달 가능한 단층의 형태를 규정하는데 중점을 두었다. 쌍정의 평균 변형률, 두께, 치밀도와 쌍정의 형태로부터 연구지역에서 쌍정의 생성 온도를 추정해 보면 약 70 ℃ 이하였다. 방해석 맥내의 쌍정으로부터 얻은 최대수축 방향은 NNE-SSW이며, 이때 작용한 응력장으로부터 발생될 단층의 형태는 정단층일 것으로 판단된다. 그리고 석영내의 아문미세균열로부터 결정한 최대수평응력은 뚜렷한 NE-SW 방향을 가리켰다. 기존의 고응력장과 이 연구의 결과를 비교해 볼 때, 연구지역에는 제3기 올리고세 후기부터 마이오세 초기 동안 NNE-SSW나 NE-SW 방향의 고응력장이 작용했음을 시사한다. 수압파쇄시험에 의해 산정한 수직, 최소 및 최대수평응력의 크기는 σv=1.121 MPa, σh=2.800 MPa, σH=3.187 MPa으로 나타났으며, 이들 응력상태는 스러스트단층을 발생시키는 응력상태와 관련됨을 의미한다. 수압파쇄에 의한 평균측압계수(Kave)는 2.670, 인장강도(σT)는 4.267 MPa이며, 최대수평응력의 방향은 진북을 기준으로 163.5°(NNW-SSE)로 나타났다. 이상의 세 방법으로부터 얻어진 응력장의 방향을 고려해 볼 때, 연구지역의 응력상태는 과거의 NNE-SSW나 NE-SW 방향에서 현재의 NNW-SSE 방향으로 변화하였음을 지시한다.
키워드
방해석 쌍정
아문미세균열
수압파쇄시험
응력변형사
응력상태
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Information
  • Publisher :The Korean Society of Mineral and Energy Resources Engineers
  • Publisher(Ko) :한국자원공학회
  • Journal Title :Journal of the Korean Society for Geosystem Engineering
  • Journal Title(Ko) :한국지구시스템공학회지
  • Volume : 44
  • No :2
  • Pages :95-106
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