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2026 Vol.36, Issue 2 Preview Page

Research Article

Engineering Performance and Correlation Analysis of Racetrack Sand as a Function of Fineness Modulus

경주로 모래의 조립률에 따른 공학적 성능 특성 및 상관관계 분석

Hwijong Oh1
,
Doogyeong Kim2
,
Hyeok Seo3*
오 휘종1
,
김 두경2
,
서 혁3*
1MS Student, Department of Civil & Environmental Engineering, Honam University
2Undergraduate Student, Department of Civil & Environmental Engineering, Honam University
3Assistant Professor, Department of Civil & Environmental Engineering, Honam University
1호남대학교 토목환경공학과 석사과정
2호남대학교 토목환경공학과 학사과정
3호남대학교 토목환경공학과 조교수
*Corresponding Author
30 June 2026. pp. 197-210
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Abstract

Racetrack surface sand must simultaneously satisfy requirements for drainage performance and shear strength. The objective of this study is to investigate the quantitative correlation between the fineness modulus (FM)—a key quality control index—and the engineering performance of the sand. To this end, laboratory tests including particle size distribution, constant head permeability, and direct shear tests were performed on original samples (new and 1-year-used racetrack sands, as well as commercial coarse, medium, and fine sands) and silica-mixed samples, followed by regression analysis. The analysis indicated a positive trend between FM and the coefficient of permeability (original samples: R2 = 0.493, silica-mixed samples: R2 = 0.456). Conversely, the correlation between FM and cohesion was low (original samples: R2 = 0.224, silica-mixed samples: R2 = 0.087). The correlation with the internal friction angle was relatively high only in the original sand groups (original samples: R2 = 0.611, silica-mixed samples: R2 = 0.250), suggesting that FM may be more closely related to drainage performance than to shear characteristics, although the explanatory power is limited.

Keywords
fineness modulus
coefficient of permeability
internal friction angle
correlation analysis
racetrack

경주로 표층 모래는 원활한 경기 운영을 위해 배수 성능과 전단강도를 동시에 만족해야 하며, 주요 품질 지표인 조립률과 공학적 성능 간의 정량적 상관관계를 규명하는 것이 본 연구의 목적이다. 이를 위해 기존 경주로 모래인 새모래(new sand, NS)와 1년 사용된 모래(aged sand, AS), 시중 모래인 왕사(coarse sand, CS), 중사(medium sand, MS), 세사(fine sand, FS), 그리고 혼합 재료인 규사3호(silica sand, SS-3)를 대상으로 입도분포, 정수위 투수, 직접전단 시험을 수행하고 회귀분석을 진행하였다. 분석 결과, 조립률과 투수계수간에는 증가 경향(기존시료: R2 = 0.493, 혼합시료: R2 = 0.456)이 확인되었다. 반면 점착력과의 상관성(기존시료: R2 = 0.224, 혼합시료: R2 = 0.087)은 낮았고, 내부마찰각과의 상관성(기존시료: R2 = 0.611, 혼합시료: R2 = 0.250)은 기존시료에서만 비교적 높은 상관성을 보여, 조립률이 전단특성보다는 배수 성능과 더 관련 있음이 확인되었으나, 그 설명력은 제한적인 수준으로 판단된다. 또한 단가(원/m3)를 포함한 성능-비용 분석을 수행한 결과, FS-SS-3 혼합을 통해 목표 조립률을 조정함으로써 기준 투수계수를 만족하면서도 경제성을 확보할 수 있는 구간이 존재함을 확인하였다. 이는 조립률이 경주로 모래의 배수 성능을 관리하기 위한 보조적 관리 지표로 활용될 수 있으며, 혼합 설계를 통해 성능과 경제성을 동시에 고려한 합리적인 재료 선정이 가능함을 제시한다.

키워드
조립률
투수계수
내부마찰각
상관관계분석
경주로
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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 : 36
  • No :2
  • Pages :197-210
  • Received Date : 2026-03-05
  • Revised Date : 2026-04-09
  • Accepted Date : 2026-04-10
  • DOI :https://doi.org/10.9720/kseg.2026.2.197
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