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2021 Vol.31, Issue 4 Preview Page

Research Article

Machine-Learning Evaluation of Factors Influencing Landslides

머신러닝기법을 이용한 산사태 발생인자의 영향도 분석

Seong-Yong Park1
,
Seong-Woo Moon2
,
Jaewan Choi3
,
Yong-Seok Seo4*
박 성용1
,
문 성우2
,
최 재완3
,
서 용석4*
1Master Student, Department of Earth and Environmental Sciences, Chungbuk National University
2Post-Doctor, Department of Earth and Environmental Sciences, Chungbuk National University
3Professor, Department of Civil Engineering, Chungbuk National University
4Professor, Department of Earth and Environmental Sciences, Chungbuk National University
1충북대학교 지구환경과학과 석사과정
2충북대학교 지구환경과학과 박사 후 연구원
3충북대학교 토목공학과 교수
4충북대학교 지구환경과학과 교수
*Corresponding Author
31 December 2021. pp. 701-708
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Abstract

Geological field surveys and a series of laboratory tests were conducted to obtain data related to landslides in Sancheok-myeon, Chungju-si, Chungcheongbuk-do, South Korea where many landslides occurred in the summer of 2020. The magnitudes of various factors’ influence on landslide occurrence were evaluated using logistic regression analysis and an artificial neural network. Undisturbed specimens were sampled according to landslide occurrence, and dynamic cone penetration testing measured the depth of the soil layer during geological field surveys. Laboratory tests were performed following the standards of ASTM International. To solve the problem of multicollinearity, the variation inflation factor was calculated for all factors related to landslides, and then nine factors (shear strength, lithology, saturated water content, specific gravity, hydraulic conductivity, USCS, slope angle, and elevation) were determined as influential factors for consideration by machine learning techniques. Minimum-maximum normalization compared factors directly with each other. Logistic regression analysis identified soil depth, slope angle, saturated water content, and shear strength as having the greatest influence (in that order) on the occurrence of landslides. Artificial neural network analysis ranked factors by greatest influence in the order of slope angle, soil depth, saturated water content, and shear strength. Arithmetically averaging the effectiveness of both analyses found slope angle, soil depth, saturated water content, and shear strength as the top four factors. The sum of their effectiveness was ~70%.

Keywords
influential factor of landslide
evaluation of effectiveness
logistic regression analysis
artificial neural network analysis

본 연구에서는 산사태가 다수 발생한 충주 산척면 지역을 대상으로 야외지질조사 및 일련의 실내시험을 수행하여 데이터를 취득하고, 이후 인공신경망(Artificial neural network)과 로지스틱 회귀분석(Logistic regression)을 적용하여 각 인자가 산사태 발생에 미치는 영향도를 분석하였다. 야외지질조사 시 산사태 발생 유무에 따라 불교란시료를 채취하였으며, 동적 콘 관입시험기를 이용하여 토심을 측정하였다. 실내시험은 미국 표준시험법인 ASTM 규정에 따라 진행되었으며, 인자간 다중공선성을 해결하기 위해 VIF(Variation inflation factor)를 산정하였다. 다중공선성 분석을 통해 총 9개 인자(전단강도, 암종, 토심, 포화함수비, 비중, 투수계수, USCS, 사면 경사, 고도)가 분석에 적용되었다. 추후 도출되는 각 인자별 영향도를 직접적으로 비교하기 위해서 데이터는 최소값 0, 최대값 1이 되도록 최소-최대 정규화한 후 로지스틱 회귀분석 및 인공신경망 분석에 적용되었다. 로지스틱 회귀분석 결과, 토심, 경사, 포화함수비, 전단강도 순으로 산사태 발생에 영향력이 크게 나타났으며, 인공신경망 분석 결과, 경사, 토심, 포화함수비, 전단강도 순으로 영향력이 크게 나타났다. 각 분석기법으로 산정된 영향도를 산술평균한 결과, 토심, 경사, 포화함수비, 전단강도가 상위 4개 인자로 선정되었으며, 이들의 영향도 합계는 약 70%로 분석되었다.

키워드
산사태 발생 영향인자
영향도 분석
로지스틱 회귀분석
인공신경망 분석
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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 : 31
  • No :4
  • Pages :701-708
  • Received Date : 2021-12-15
  • Revised Date : 2021-12-21
  • Accepted Date : 2021-12-21
  • DOI :https://doi.org/10.9720/kseg.2021.4.701
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