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2025 Vol.41, Issue 4 Preview Page
Experimental Assessment of Particle Breakage in Weathered Granite Soils under Impact Loading

충격하중에 의한 화강풍화토 입자파쇄의 실험적 평가

Han-Gyu Yun1
,
Inhyun Kim2
,
Sung-Ha Baek3*
윤 한규1
,
김 인현2
,
백 성하3*
1Master Student, School of Civil and Environmental Engineering, Hankyong National University
2Member, Post-doctoral Researcher, Department of Civil and Environmental Engineering, Incheon National Univ.
3Member, Assistant Prof., School of Civil and Environmental Engineering & Construction Engineering Research Institute, Hankyong National Univ.
1비회원, 한경국립대학교 건설환경공학부 석사과정
2정회원, 인천대학교 건설환경공학부 박사후연구원
3정회원, 한경국립대학교 건설환경공학부 조교수
*Corresponding Author
31 August 2025. pp. 155-171
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Abstract

In this study, weathered granite soil collected from an earthwork construction site was reconstituted into poorly graded sand (SP) and well-graded sand (SW) specimens. Laboratory compaction tests were conducted under various compaction energy levels. The findings indicated that particle breakage occurred in both specimens with increasing compaction energy, resulting in upward shifts in the particle size distribution curves and a progressive increase in the roundness of the particles. The SW specimen demonstrated a higher degree of resistance to breakage in comparison to the SP specimen. Furthermore, the occurrence of particle breakage was not uniform across all particle sizes; rather, it was concentrated within specific size bands. Initially, particles larger than 4.75 mm were predominantly broken; however, as compaction continued, particles smaller than 2.36 mm became the primary targets of breakage. The quantification of such stage-wise behavior proved to be a formidable challenge, given the limitations of existing breakage indices. Although the fractal dimension proved beneficial in examining breakage characteristics across different particle sizes, it did not align with the transition points obtained from mass-retained analysis. Consequently, the development of a novel quantitative index capable of elucidating these phenomena is imperative.

Keywords
Breakage index
Compaction
Fractal dimension
Particle breakage
Particle shape
Weathered granite soil

본 연구에서는 토공사 현장에서 채취한 화강풍화토를 인위적으로 빈입도(SP) 및 양입도(SW) 시료로 조성하고, 다양한 다짐에너지를 적용하여 실내 다짐시험을 수행하였다. 그 결과, 두 시료 모두에서 다짐에너지 증가에 따라 입자파쇄가 발생하며 입도분포곡선이 우상향했고, 입자 형상은 점차 원형에 가까워졌다. SW 시료는 SP 시료보다 파쇄 저항성이 높았으며, 입자파쇄는 전 입경 범위에서 균일하게 발생하지 않고 특정 입경대에서 단계적으로 집중되었다. 초기에는 4.75 mm 이상의 굵은 입자가 주로 파쇄되었으나, 이후에는 2.36 mm 이하의 중간 입자 및 미세입자가 파쇄의 중심이 되었다. 이러한 단계별 거동은 기존 파쇄지수로는 정량화하기 어려웠으며, 프랙탈 차원은 입경 구간별 상이한 파쇄 특성을 나타내는 데 유용하나 파쇄 특성의 전환점이 잔존량 분석 결과와 일치하지 않았다. 따라서 이러한 현상을 설명할 수 있는 새로운 정량 분석 지표 개발이 필요하다.

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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 :4
  • Pages :155-171
  • Received Date : 2025-07-31
  • Revised Date : 2025-08-16
  • Accepted Date : 2025-08-26
  • DOI :https://doi.org/10.7843/kgs.2025.41.4.155
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