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Research Article

Analysis of Factors Influencing Landslide Occurrence along a Forest Road Near Sangsan Village, Chungju, Korea

충주시 상산마을 주변 임도 산사태의 발생 원인 분석

Hyeong-Sin Kim1
Seong-Woo Moon2
Yong-Seok Seo3*
김 형신1
문 성우2
서 용석3*
1Ph.D. Student, Department of Disaster Prevention Engineering, Chungbuk National University
2Post-Doctor, Department of Earth and Environmental Sciences, Chungbuk National University
3Professor, Department of Earth and Environmental Sciences, Chungbuk National University
1충북대학교 방재공학 학과간협동과정 박사과정
2충북대학교 지구환경과학과 박사 후 연구원
3충북대학교 지구환경과학과 교수
*Corresponding Author
31 March 2022. pp. 73-83
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Abstract

충주시 상산마을 주변 임도에서 집중호우 기간 중 산사태가 발생한 임도 상부사면 6개소, 하부사면 24개소를 대상으로 붕괴 원인을 분석하였다. 토층의 물리 ‧ 역학적 특성은 임도 하부사면이 상부사면에 비해 공극이 많아 건조단위중량이 낮고, 토층의 입자 배열이 느슨하여 마찰각이 작다. 지형학적 특성은 임도 하부사면이 상부사면에 비해토층이 두껍고, 경사방향의 수직 및 수평 방향으로 오목하며, 경사는 상대적으로 완만하고, 특정집수면적이 넓어 지형습윤지수가 높은 특징을 보인다. 따라서 임도 하부사면은 상부사면보다 물리 ‧ 역학적 특성 및 지형학적 특성이 전반적으로 산사태 발생에 취약한 것으로 나타났다. 상기 두 원인 외에도 임도 배수시설의 시공 및 유지관리가 적절하게 수행되지 못한 점도 사면붕괴의 발생 원인 중 하나로 분석된다.

키워드
산사태
임도
물리 ‧ 역학적 특성
지형학적 특성
배수시설

The factors influencing landslide occurrence were analyzed for six points on the upper slope and the 24 points on the lower slope along a forest road around Sangsan village in Chungju, Korea, where landslides have occurred due to heavy rainfall. In terms of physico-mechanical properties of the soil layer, the lower slope seemed to loosen owing to the higher porosity, lower unit weight, and lower friction angle compared with the upper slope. With respect to topographic characteristics, the lower slope had thicker regolith, more concave profile and plan curvatures, lower slope angles, and higher topographic wetness index values than the upper slope. Therefore, all the properties (except for the slope angle) appear to make the lower slope of the forest road more vulnerable to landslides than the upper slope. Apart from the physico-mechanical and topographic characteristics, inadequate maintenance and management of drainage facilities are also considered as further major factors influencing landslide occurrence.

Keywords
landslide
forest road
physico-mechanical property
topographic characteristic
drainage facility
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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 : 32
  • No :1
  • Pages :73-83
  • Received Date :2022. 03. 08
  • Revised Date :2022. 03. 25
  • Accepted Date : 2022. 03. 27
  • DOI :https://doi.org/10.9720/kseg.2022.1.073
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