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2025 Vol.41, Issue 6 Preview Page
Statistical Analysis of Soil Characteristics Associated with Landslides in the Honam Region

통계기법을 이용한 호남지역 산사태의 토질특성 분석

Daehyeon Kim1
,
Chanwook Jeong2
,
Kyungho Park3*
김 대현1
,
정 찬욱2
,
박 경호3*
1Member, Prof., Dept. Civil Engineering, Chosun Univ.
2Member, CEO, JungJin ENC Co., Ltd.
3Member, Assistant Prof., Dept, Civil Construction Engineering, Chosun College of Science and Technology
1정회원, 조선대학교 토목공학과 교수
2정회원, ㈜정진이엔씨 대표이사
3정회원, 조선이공대학교 토목건설과 조교수
*Corresponding Author
31 December 2025. pp. 261-279
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Abstract

The study aims to identify soil characteristics associated with large-scale landslides that occurred in the Honam region. Major landslide cases on natural slopes were analyzed from a geotechnical perspective, with emphasis on soil properties related to geological conditions. In addition, statistical models were developed to estimate shear strength parameters, which are critical factors influencing landslide occurrence, based on correlations among key ground properties. Soil characteristics of gneiss and granite were analyzed in landslide-prone areas affected by heavy rainfall. The results show that gneiss soils exhibit higher void ratios and porosity, whereas granite soils have higher dry unit weights. Correlations among soil properties, permeability coefficient, and shear strength parameter were examined for landslide- affected slopes. Using the derived correlation equations, variations in shear strength were predicted based on changes in fundamental physical properties. Statistical analysis revealed that cohesion showed significant correlation with fine-grained soil content and uniformity coefficient, while internal friction angle was strongly correlated with void ratio, uniformity coefficient, and dry unit weight. Based on these relationships, simplified models were proposed to estimate shear strength parameters for granite and gneiss soil layers using basic physical property data. Further refinement of these models using additional landslide and geotechnical data from the Honam region is expected to improve their reliability and applicability.

Keywords
Gneiss
Granite
Landslide
Shear strength
Statistical analysis

이 연구의 목적은 호남지역에서 발생한 대규모 산사태를 기반으로 산사태의 토질에 대한 특성을 분석하였다. 자연 사면에서 발생한 주요 산사태들은 산사태와 관련된 각 지질 유형의 토질 특성에 대한 정확한 분석을 통해 지반공학적 관점으로 분석하였다. 또한, 산사태의 주요 요인인 지반 매개변수의 특성 분석 결과를 바탕으로 산사태에 중요한 영향을 미치는 것으로 간주되는 전단강도를 쉽게 계산할 수 있는 모델을 제안하였다. 집중호우로 인해 산사태가 집중된 지역에서 지질 조건이 다른 편마암과 화강암의 토질 특성을 분석한 결과, 지질에 따라 다른 토질 특성을 보였다. 간극비와 공극률은 화강암 토질보다 편마암 토질에서 더 크고, 건조단위중량은 편마암 토질층보다 화강암 토질층에서 더 큰 것으로 나타났다. 산사태가 발생한 자연 사면의 토질층에서 토질 특성, 투수계수, 전단강도 매개변수 간의 상관관계를 분석하였고, 이로부터 도출된 상관 방정식을 사용하여 독립변수(기본 물리적 특성)의 변화로부터 종속변수(전단강도)의 변화를 예측하였다. 통계 기법을 사용하여 지반 매개변수와의 상관관계를 분석한 결과, 전단강도인 점착력은 세립토 함량 및 균등계수와 유의미한 상관관계가 있으며, 내부마찰각은 간극비, 균등계수, 건조단위중량과 유의미한 상관관계가 있는 것으로 나타났다. 화강암 및 편마암 토질층에 대해, 산사태 지역에서 중요하게 여겨지는 전단강도를 지반 매개변수와 유의미한 상관관계가 있는 물리적 특성 데이터만으로 쉽고 편리하게 추정할 수 있는 모델을 개발하였다(점착력 계산 모델 및 전단강도 계산 모델). 향후 호남지역에서 발생하는 산사태 데이터 및 지반정수를 추가함으로써 모델의 수정 및 보완을 통해 현재 모델의 신뢰성과 정확도를 향상시킬 것으로 기대된다.

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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 : 41
  • No :6
  • Pages :261-279
  • Received Date : 2025-12-02
  • Revised Date : 2025-12-08
  • Accepted Date : 2025-12-09
  • DOI :https://doi.org/10.7843/kgs.2025.41.6.261
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