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Research Article

Infinite Slope Stability to Analyze the Effects of Rainfall and Vertical Seismic Coefficient in Limestone Area

강우와 연직 지진계수의 영향도 분석을 위한 석회암지역의 무한사면 안정해석

Seong-Woo Moon1
,
Hyeong-Sin Kim2
,
Hyun-Seok Yun1
,
Yong-Seok Seo3*
문 성우1
,
김 형신2
,
윤 현석1
,
서 용석3*
1Post-doctor, Department of Earth and Environmental Sciences, Chungbuk National University
2Ph.D. Student, Department of Disaster Prevention Engineering, Chungbuk National University
3Professor, Department of Earth and Environmental Sciences, Chungbuk National University
1충북대학교 지구환경과학과 박사후 연구원
2충북대학교 방재공학 학과간협동과정 박사과정
3충북대학교 지구환경과학과 교수
*Corresponding Author
30 June 2020. pp. 175-184
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Abstract

In Korea, there are many regulations and cases for horizontal seismic coefficient to pseudo-static analysis of slope, but there are insufficient regulations and cases for vertical seismic coefficient. Therefore, geological investigation and laboratory tests were conducted to analyze the effect of the vertical seismic coefficient on slope stability, and pseudo-static analyses based on infinite slope stability analysis were performed by using those results. As a result, if the earthquake magnitude is less than M 5.0, the effect of the vertical seismic coefficient is not significant, and if the earthquake magnitude is more than M 6.0, the vertical seismic coefficient largely increases the unstable areas of Fs ≤ 1.1. These tendency is more distinct in rainfall condition than without rainfall condition.

Keywords
infinite slope stability analysis
pseudo-static analysis
vertical seismic coefficient
horizontal seismic coefficient
earthquake magnitude

국내에서는 비탈면을 대상으로 유사정적해석 시 수평 지진계수에 대한 적용 규정과 적용 사례들이 많이 있지만 연직 지진계수에 대한 규정이나 사례는 미비한 실정이다. 본 연구에서는 연직 지진계수의 영향도를 검토하고자 단양군 단양읍 ○○리를 대상으로 현장조사 및 실내시험을 수행하고, 이를 반영하여 무한사면 안정해석 기반의 유사정적 사면안정해석을 수행하였다. 분석 결과 지진규모가 5 이하인 경우에는 연직 지진계수의 영향이 거의 없는 것으로 분석되며, 지진규모가 6 이상인 경우에는 연직 지진계수가 안전율 1.1 이하의 불안정 영역을 크게 증가시키는 것으로 나타난다. 이러한 경향은 강우가 없는 조건보다 강우가 있는 조건에서 더욱 뚜렷하게 나타난다.

키워드
무한사면 안정해석
유사정적해석
연직 지진계수
수평 지진계수
지진 규모
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 30
  • No :2
  • Pages :175-184
  • Received Date : 2020-06-04
  • Accepted Date : 2020-06-17
  • DOI :https://doi.org/10.9720/kseg.2020.2.175
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