한국지반공학회논문집 (Journal of the Korean Geotechnical Society)

  • 제32권9호
  • /
  • Pages.29-36
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  • 2016
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  • 1229-2427(pISSN)
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  • 2288-646X(eISSN)
한국지반공학회 (Korean Geotechnical Society)
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철도교대 뒤채움재료의 시멘트 혼합 비율에 따른 강도 및 침하특성 분석

Analysis of Settlement Characteristics and Strength of Cement Mixing Ratio for a Backfill Material at a Railway Abutment

  • 양상범 (성균관대학교, 건설환경시스템공학과) ;
  • 최찬용 (한국철도기술연구원 고속철도연구본부) ;
  • 김낙경 (성균관대학교 건설환경시스템공학과) ;
  • 김태균 (인천대학교 건설환경시스템공학과)
  • Yang, Sang-Beom (Dept. of Civil, Architecture and Environmental Systems Engrg., Sungyunkwan Univ.) ;
  • Choi, Chan-Yong (High-Speed Railway Research Division, Korea Railroad Research Institute) ;
  • Kim, Nak-Kyung (Dept. of Civil, Architecture and Environmental Systems Engrg., Sungyunkwan Univ.) ;
  • Kim, Tae-Kyun (Dept. of Civil and Environment Engrg., Incheon National Univ.)
  • 투고 : 2016.06.23
  • 심사 : 2016.09.12
  • 발행 : 2016.09.30
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초록

국내 철도교대 뒤채움재의 구조는 시멘트 안정처리된 골재, 일반 골재, 토사로 되어 있다. 시멘트 안정처리된 골재는 강도 증진효과로 인해 내부마찰각이 $40^{\circ}$이상 증가 된다. 그러나 실무에서는 교대설계 시 경험치인 $30{\sim}35^{\circ}$의 내부마찰각을 적용한다. 이는 과다설계의 원인이 될 수 있으므로 합리적인 물성치 값의 설정이 필요하다. 본 논문은 원형모형 실험과 CBR 실험을 통해 시멘트 안정처리된 골재의 시멘트 혼합 비율에 따른 강도 및 침하특성을 정량적으로 분석하였다. 시멘트 안정처리된 골재의 침하율은 반복재하 함에 따라 감소하였다. 또한 양생함에 따라 침하량이 감소하였다. 재령 28일 기준으로 일반골재 대비 시멘트 안정처리된 골재의 CBR 증가율은 13~16배 증가하였다.

Backfill materials of rail abutment were commonly composed with cement treated aggregate, general aggregate and soil. The friction angle of cement treated aggregate increased up to $40^{\circ}$ or more due to strength enhancement. However, $30^{\circ}{\sim}35^{\circ}$ of friction angle was typically applied for in-situ condition. This phenomenon could cause over-designing, therefore, it is essential to determine reasonable material properties of cemented treated aggregate. In this study, a series of CBR tests and circular model tests have been conducted for cement treated aggregate, while changing cement mixing ratio. Based on test results, characteristics of settlement and strength have been analyzed quantitatively. The settlement of cement treated aggregate decreased with the number of cyclic loading and aging period. In addition, The strength increment ratio in CBR test increased up to 13~16 times at 28 days aging.

키워드

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