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2022 Vol.32, Issue 2 Preview Page

Research Article

Change in the Characteristics of Particle Separation and Particle Size Distribution of Weathered Granite Soil from the Yecheon Area (Eastern South Korea) after Water Washing

물 세척한 예천지역 화강풍화토의 입자분리와 입도분포 변화 특성

Suk-Joo Kim1*
김 석주1*
1Professor, Department of Civil Engineering, Gyeongbuk Provincial College
1경북도립대학교 토목공학과 교수
*Corresponding Author
30 June 2022. pp. 241-255
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Abstract

In this study, sieve analysis testing was performed on weathered granite soil from Yecheon (eastern South Korea) before and after water washing in accordance with the sieve analysis regulations of KS F 2302. The changes in particle separation and particle size distribution after washing with water were analyzed. Image analysis using an optical microscope revealed that soil particles were separated into smaller particles by water washing. The change in the particle size distribution curve was assessed using five index values. The increase in the fine particle fraction (<0.075 mm) was 13.67%, the increase in the 0.075-0.25 mm fraction was 19.44%, and the mean particle diameter (D50) decreased by 0.663 mm. In addition, the maximum passage width (BM) of the particle size distribution curve increased by 21.08% for the #30 sieve, and the moving area (A) of the particle size distribution curve was 69.28% ‧ mm. These results suggest that washing with water is an effective way to prevent underestimation of the fine particle content in soil.

Keywords
water wash
weathered granite soil
particle separation
particle size distribution curves
optical microscope

본 연구에서는 예천지역의 화강풍화토에 대하여 KS F 2302의 체 분석 방법과 규정에 준하여 체분석 시험을 수행하고, 물 세척시 발생되는 흙의 입자분리와 입도분포 변화의 특성을 비교 분석하였다. 광학현미경에 의한 영상이미지 분석결과 흙입자가 물에 의해 더 작은 입자로 분리됨을 확인하였고 입도분포곡선의 변화를 5가지 지표값으로 산출한 결과 세립분(0.075 mm)의 증가량은 13.67%, 임의 입경(0.25 mm)의 증가량은 19.44%, 입도분포곡선의 최대통과율폭(BM)은 #30 체에서 21.08%가 증가되었고 입도분포곡선의 이동면적(A)은 69.28% ‧ mm로 분석되었으며 평균입경(D50)은 0.663 mm가 감소되었다. 이러한 결과는 물 세척을 수행하는 것이 세립토의 함량이 실제보다 과소평가 되는 것을 막을 수 있는 효과적인 방법임을 의미한다.

키워드
물 세척
화강풍화토
입자분리
입도분포곡선
광학현미경
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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 :2
  • Pages :241-255
  • Received Date : 2022-05-10
  • Revised Date : 2022-06-15
  • Accepted Date : 2022-06-20
  • DOI :https://doi.org/10.9720/kseg.2022.2.241
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