터널과지하공간 (Tunnel and Underground Space)

  • 제25권6호
  • /
  • Pages.487-495
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  • 2015
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  • 1225-1275(pISSN)
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  • 2287-1748(eISSN)
한국암반공학회 (Korean Society for Rock Mechanics and Rock Engineering)
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철도 밸러스트 선정 효율성에 대한 고찰 : 프랑스 채석장에 대한 사례연구

Study on Effectiveness of Selection for Railway Ballast : Case Study on A Quarry in northen France

  • Woo, Ik (Dept. Coastal Construction Engineering, Kunsan National University)
  • 투고 : 2015.12.04
  • 심사 : 2015.12.16
  • 발행 : 2015.12.31
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초록

이 연구는 프랑스에서 사용되는 철도 밸러스트를 선정하는 규준에 대하여 논하고, 프랑스 북부에 위치하고 있는 한 채석장을 대상으로 철도 밸러스트 선정 효율성에 대한 연구를 수행하였다. 철도 밸러스트의 품질은 대부분 입도분포와 마모 저항성으로 평가된다. 마모 저항성은 로스앤젤레스 마모 실험과 마이크로 드발 실험에 의해 평가되며, 고속철도와 일반철도용 밸러스트의 품질은 이들 두 마모 지수에 의해 결정된다. 이 연구는 채석장의 생산 과정에서 단계가 다른 3 종류의 골재를 채취하여, 각각에 대하여 마모 실험을 수행하여 획득한 마모지수들의 상관관계를 분석하였다. 로스앤젤레스 마모 지수(LA)와 마이크로 드발 지수(MDA) 사이에는 높은 상관도를 보이고 있고, 단계별 골재들 사이의 마모 지수도 높은 상관도를 보이고 있다. 특히, 발파 직후 현장에서 채취한 골재의 마모 지수(LA 및 MDA)와 최종 생산 단계에서 채취한 골재의 마모 지수 사이의 상관관계를 이용하면, 현장에서 빠른 시일 내에 최종 골재의 품질을 큰 오차 없이 예측할 수 있어 작업 효율성이 증대할 것으로 기대된다.

The specification for selecting railway ballast in France is introduced in this study and the effectiveness of selection for railway ballast is studied for the case of a quarry located in northen France. The quality of railway ballast is, in general, estimated depending on the grain distribution and mainly of the resistance against abrasion. The resistance against abrasion is obtained by both Los Angeles abrasion test and Micro Deval test, which determine the ballast quality suitable whether for high speed railway or classical railway. This study analyzed the correlation between the abrasion index obtained from the abrasion tests for the aggregates sampled at three different stages among ballast production procedure at the quarry. A high correlation is determined between Los Angeles Abrasion index (LA) and Micro Deval index (MDA) and also between abrasion indices of different aggregates. Particularly, this correlation between the abrasion indices allows to estimate the quality of ballast at the final stage from the aggregates at the site in a quarry within the margin of error.

키워드

참고문헌

  1. American Society for Testing and Materials, 2006, Standard test method for resistance to degradation of small-size coarse aggregate by abrasion and impact in the Los Angeles machine, ASTM Designation C131-06.
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  3. American Society for Testing and Materials, 2009, Standard test method for resistance to degradation of large-size coarse aggregate by abrasion and impact in the Los Angeles machine, ASTM Designation C535-09.
  4. Erichsen, E., Ulvik, A., Saevik, K., 2011, Mechanical degradation of aggregate by the Los Angeles-, the Micro-Deval and the Nordic test methods, Rock Mechanics and Rock Engineering, Vol. 44, Issue 3, pp. 333-337. https://doi.org/10.1007/s00603-011-0140-y
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