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Characteristics Analysis of Mudstone Weathered Soils in the landslide Area using Statistical Technique

통계기법에 의한 산사태발생지역 이암 풍화토층의 토질특성 분석

Eui-Soon Hwang1
,
Dae-Seouk Chung2
,
Kyeong-Su Kim3*
,
Moon-Se Lee4
,
Young-Suk Song5
황 의순1
,
정 대석2
,
김 경수3*
,
이 문세4
,
송 영석5
1Graduate Student, Department of Civil Engineering, Joongbu University.
2Professor, Department of Civil Engineering, Joongbu University.
3Principal Researcher, Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources
4Principal Researcher, Research & Development Team, National Forestry Cooperative Federation
5Principal Researcher, Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources
*교신저자. *Corresponding Author. 
30 September 2013. pp. 31-41
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Abstract

In this study, the properties of mudstone weathered soils related to landslides were analyzed at the area of landslide induced by heavy rainfall in Pohang. The soil tests were carried out to the soils obtained from landslide and non landslide sites, and the soil properties were investigated. The correlation between soil properties and landslides were analyzed using statistical technique, and then the soil factors were extracted from the correlation analysis. The correlation equation which can calculate the coefficient of permeability influenced on landslides was proposed using the soil factors. As the result of analysis, the porosity and unit weight of soils from the landslide area is smaller than those of soils from the non landslide area. The soils with poor grain size distribution and loose unit weight are prone to landslides because the soils have a large void ratio and a low unit weight. The permeability of soils from the landslide area is larger than that of soils from the non landslide area. According to the result of correlation analysis, the effective grain size, the saturated unit weight and silt and clay contents are evaluated as the influence factors. These factors were considered to estimate the coefficient of permeability of mudstone weathered soils.

Keywords
Landslide
Mudstone weathered soil
Soil characteristics
Permeability coefficient
Correlation model

이 연구는 집중호우로 인해 산사태가 집중적으로 발생한 포항지역 이암 풍화토층을 대상으로 산사태와 관련한 토질특성을 분석하였다. 산사태발생지역과 미발생지역으로 구분한 토층시료에 대해 토질시험을 실시하고 제반 토질특성을 파악하였다. 그리고 통계적 기법으로 토질특성과 산사태 간의 상관성을 분석하여 산사태와 상관성이 있는 토질인자를 추출하였다. 또한, 이들 토질인자를 적용하여 산사태에 유의한 영향요소인 투수계수를 쉽게 산정할 수 있는 상관식을 제안하였다. 연구결과, 산사태발생지역의 토층은 미발생지역에 비해서 간극률이 크고 밀도는 작은 것으로 나타났다. 그리고 입도가 불량하고 느슨한 토층지반은 특징적으로 큰 간극과 작은 밀도를 지님으로써 산사태에 더 취약한 것으로 분석되었다. 또한, 산사태발생지역의 토층이 미발생지역에 비해 다소 큰 투수성지반인 것으로 나타났다. 한편, 상관성분석 결과 유효경, 간극비, 포화단위중량, 및 세립함유량이 투수계수에 유의한 영향인자인 것으로 평가됨으로써 이들 토질인자는 이암 풍화토층의 투수계수산정시 고려되어야 할 토질인자인 것으로 평가되었다.

References
1
1.Chae, B. G., Kim, W. Y., Cho, Y. C., Kim, K. S., Lee, C. O., and Choi, Y. S. (2004), “Development of a Logistic Regression Model for Probabilistic Prediction of Debris Flow”, The Journal of Engineering Geology, Vol.14, No.2, pp.211-222 (in Korean).
2
2.Darcy, H. (1856), “Les Fontaines Publiques de la Ville de Digon”, Dalmont, Paris.
3
3.Giannecchini, R., and Pochini, A. (2003), “Geotechnical influence on soil slips in the Apuan Alps (Tuscany): first results in the Cardoso area”. Proc, International Conference on Fast Movements-Prediction and Prevention for Risk Mitigation (IC-FSM 2003), pp.241-245.
4
4.Huchinson, J. N. (1988), “Morphological and geotechnical parameters of landslides in relation to geology and hydro-geology”, In Landslides, Proc. 5th Symp. on Landslides, 1, pp.3-35.
5
5.Kim, K. S. (2007), “Soil Characteristics according to the Geological Condition of Natural Slopes in Busan Area”, The Journal of Engineering Geology, Vol.17, No.3, pp.471-481 (in Korean).
6
6.Kim, K. S., Kim, W. Y., Chae, B. G., and Cho, Y. C. (2000), “Engineering Geologic Characteristics of Landslide Induced by Rainfall - Boeun, Chungcheong Buk-do-”, The Journal of Engineering Geology, Vol.10, No.2, pp.163-174 (in Korean).
7
7.Kim, K. S., Kim, W. Y., Chae, B. G., Song, Y. S., and Cho, Y. C. (2005), “Engineering Geological Analysis of Landslides on Natural Slopes Induced by Rainfall”, The Journal of Engineering Geology, Vol.17, No.2, pp.205-215 (in Korean).
8
8.Kim, W. Y., Chae, B. G., Kim, K. S., Cho, Y. C., Choi, Y. S., Lee, C. O., Lee, C. W., Kim, G. Y., Kim, J. H., and Kim, J. M. (2003), Study on Landslide Hazard Prediction, Ministry of Science & Technology, KR-03-(T)-03, 339p (in Korean).
9
9.Lee, J. S., Lee, K. I., and Kim, K. W. (2002), “Shear and Compression Characteristics of Mudstone Sedimentary Soils Based on Slaking”, Journal of the Korean Society of Civil Engineers, Vol.22, No.4C, pp.453-460 (in Korean).
10
10.Song, Y. S., Kim, K. S., and Chae, B. G. (2007), “Soil Characteristics according to Geological Conditions in Landslide Area of Natural Terrain", Disaster Prevention Research Institute of Chung-Ang University, Vol.1, pp.43-49 (in korean).
11
11.Um, S. H., Lee, D. W., and Bak, B. S. (1964), Explanatory text of the geologic map of Pohang sheet, Geological Survey of Korea.
Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 12
  • No :3
  • Pages :31-41
  • Received Date : 2013-08-28
  • Revised Date : 2013-09-23
  • Accepted Date : 2013-09-23
  • DOI :https://doi.org/10.12814/jkgss.2013.12.3.031
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