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Evaluation of Slope Stability of Taebaeksan National Park using Detailed Soil Map

정밀토양도를 이용한 태백산국립공원의 사면안정성 평가

  • Kim, Young-Hwan (Graduate School of Disaster Prevention, Kangwon National University) ;
  • Jun, Byong-Hee (Graduate School of Disaster Prevention, Kangwon National University) ;
  • Jun, Kye-Won (Graduate School of Disaster Prevention, Kangwon National University)
  • 김영환 (강원대학교 방재전문대학원) ;
  • 전병희 (강원대학교 방재전문대학원) ;
  • 전계원 (강원대학교 방재전문대학원)
  • Received : 2019.05.14
  • Accepted : 2019.06.14
  • Published : 2019.06.30

Abstract

More than 64% of Korea's land is occupied by mountain regions, which have terrain characteristics that make it vulnerable to mountain disasters. The trails of Taebaeksan Mountain National Park-the region considered in this study-are located in the vicinity of steep slopes, and therefore, the region is vulnerable to landslides and debris flow during heavy storms. In this study, a slope stability model, which is a deterministic analysis method, was used to examine the potential occurrence of landslides. According to the soil classification of the detailed soil map, the specific weight of soil, effective cohesion, internal friction angle of soil, effective soil depth, and ground slope were used as the parameters of the model, and slope stability was evaluated based on the DEM of a 1 m grid. The results of the slope stability analysis showed that the more hazardous the area was, the closer the ratio of groundwater/effective soil depth is to 1.0. Further, many of the private houses and commercial facilities in the lower part of the national park were shown to be exposed to danger.

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Fig. 1. Infinite slope stability analysis diagram

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Fig. 2. Study area

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Fig. 3. Slope and histogram from 1 m grid

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Fig. 4. Soil distribution in the study area

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Fig. 5. Parameters extracted from detailed soil map

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Fig. 6. Slope stability result (a) m=1.0; (b) m=0.5

Table 1. Total soil content by surface soil, specific weight, cohesion, and internal friction angle

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Table 2. Area of different soils in the study area

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Acknowledgement

Supported by : Ministry of Land, Infrastructure and Transport of Korean Government, Ministry of the Interior and Safety

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