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2018 Vol.34, Issue 8

Research Article

A Study on Anisotropy of Magnetic Susceptibility of Clastic Sedimentary Rocks in the Gyeongsang Basin

경상분지 쇄설성 퇴적암의 대자율 이방성 연구

Eun-Kyeong Choi1
,
Sung-Wook Kim2
,
Woong-Ki Hwang3
,
Hyun-Wook Kwon4
,
Tae-Hyung Kim5*
최 은경1
,
김 성욱2
,
황 웅기3
,
권 현욱4
,
김 태형5*
1Director, Geo-information Research Group, GI Co., Ltd.
2CEO, Geo-information Research Group, GI Co., Ltd.
3Postdoctoral Researcher, Dept. of Civil Engrg., Korea Maritime and Ocean Univ.
4Deputy Manager, Audit Dept., Busan Metropolitan Corporation
5Prof., Dept. of Civil Engrg., Korea Maritime and Ocean Univ
1(주)지아이 지반연구실 실장
2(주)지아이 지반연구실 대표이사
3한국해양대학교 건설공학과 박사후연구원
4부산도시공사 감사실 차장
5한국해양대학교 건설공학과 교수
* Corresponding Author
31 August 2018. pp. 5-14
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Abstract

The grain size of clastic sedimentary rocks classifies the rock types and also causes of anisotropy of the rock. The anisotropy is one of the most important factors that dominates the strength and weathering behavior of rocks. The anisotropy of clastic sedimentary and igneous rocks in the Gyeongsang Basin including Yeongju, Daegu, and Busan were analyzed by magnetic susceptibility expressed by the degree of anisotropy and shape parameter. As the results of the study, the sandstone deposited under lacustrine environment unaffected by the external force shows 1.03 degree of anisotropy. The degrees of anisotropy of the rocks affected by faults and fault rocks show 1.06 and 1.14, respectively. The magnetic susceptibility of rocks is to decrease with the distance from the fault. A fresh mudstone and shale formed by fines show a similar magnitude of the degree of anisotropy to fault rock and correspond to oblate shape parameter due to their sedimentary structure. Due to these reasons, we need attention in design, construction, and maintenance of a structure constructed in mudstone and shale.

Keywords
Clastic sedimentary rocks
Anisotropy magnetic susceptibility
Degree of anisotropy
Shape parameter
Mudstone and shale

쇄설성 퇴적암의 입자 크기는 암석을 구분하는 기준인 동시에 이방성의 원인이 된다. 이방성은 암석의 강도와 풍화에 영향을 미치는 주 원인 중 하나이다. 경상분지의 영주, 대구, 부산 지역에 분포하는 쇄설성 퇴적암과 화성암을 대상으로 대자율타원체를 결정하고 이방성정도와 모양지수를 통해 이방성을 분석하였다. 외력의 영향이 거의 없는 호성환경에서 퇴적된 사암의 이방성정도는 1.03 이하였다. 단층의 영향을 받은 암석은 1.06, 단층암은 1.14 이상의 이방성 정도를 보였다. 암석의 자기적 이방성은 단층으로부터 거리가 멀어질수록 이방성 정도가 감소하였다. 세립질의 입자로 구성된 이암과 셰일은 일차퇴적구조인 층리가 박층으로 발달하며 이로 인해 단층암과 유사한 크기의 이방성을 보였고 대자율타원체의 모양지수도 편원형을 보였다. 실험 결과로부터 쇄설성퇴적암 중 신선한 이암과 셰일은 단층암과 유사한 이방성을 가지므로 이들 암반과 관련된 구조물의 설계, 시공, 유지관리에서 주의가 필요하다.

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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 : 34
  • No :8
  • Pages :5-14
  • Received Date : 2018-03-20
  • Revised Date : 2018-07-23
  • Accepted Date : 2018-07-25
  • DOI :https://doi.org/10.7843/kgs.2018.34.8.5
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