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2014 Vol.13, Issue 4 Preview Page
Stability Evaluation of Reinforced Subgrade with Short Geogrid for Railroad During Construction

짧은 보강재를 사용한 철도보강노반의 시공 중 안정성 평가

Dae Sang Kim1*
김 대상1*
1Principal Researcher, Korea Railroad Research Institute,
*교신저자. *Corresponding Author. 
30 December 2014. pp. 11-20
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Abstract

The behaviors and stability of reinforced subgrade with short geogrid were examined and evaluated during construction. First of all, analytical approach for the minimum length of geogrid was performed to guarantee stability during construction loading state. Secondly, the economic aspects for reinforced subgrade were compared with between domestic standards applying with 0.7 H reinforcement length and new way to mix short and long reinforcement. Full scale railroad subgrade was constructed with the size of 5 m high, 6m wide, and 20m long to verify the stability of the subgrade with the length of 0.3 H, 0.35 H, 0.4 H reinforcement. Total 51 sensors were installed to measure settlement, bulging, and the change of stress of the subgrade. It is concluded that the reinforced subgrade with short(0.35H, 35% of height) geogrid had stability within allowable level of deformation and stress increment during construction.

Keywords
Reinforced subgrade for railroad
Short geogrid
Stability evaluation
Full scale
During construction

짧은 보강재를 적용한 강성벽 일체형 보강노반의 시공 중 거동에 대하여 고찰하고 안정성을 평가하였다. 우선 시공하중 상태에서 안정성이 확보될 수 있는 최소보강재 길이에 대한 이론적 고찰을 수행하고, 기존 설계기준 적용 보강재 길이(70%, 0.70H)와 짧은 보강재(35%, 0.35H) 및 장 보강재를 혼용하는 보강재 설치 패턴에 대한 경제성을 비교하였다. 높이의 30%(0.30H), 35%(0.35H), 40%(0.40H) 적용 보강노반의 시공 중 안정성을 검증하기 위하여 실물 단선용 철도노반 높이*폭*길이(5m*6m*20m)에 대한 현장시공을 실시하였다. 총 51개의 센서를 노반 내부 및 보강재에 설치하여 침하, 배부름 및 응력 변화를 확인하였다. 이를 통하여 짧은(0.35H, 높이의 35%) 지오그리드를 적용한 보강노반의 변형 및 발생 응력수준이 시공 중 안정성을 확보할 수 있는 허용범위 이내인 것을 확인할 수 있었다.

References
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2.Tatsuoka, F., Tateyama M., Uchimura T. and Koseki J. (1997), “Geosynthetic-reinforced soil retaining walls as important permanent structures (1996-1997 Mercer Lecture)”, Geosynthetics International, Vol.4, No.2, pp.81-136.
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5.Kim, D.S., Park, S.Y. and Kim, K.H. (2012), “Effects of Vertical Spacing and Length of Reinforcement on the Behaviors of Reinforced Subgrade with Rigid Wall”, Journal of the Korean Geosynthetics Society, Vol.11, No.4, pp.27-35.
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Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 13
  • No :4
  • Pages :11-20
  • Received Date : 2014-09-12
  • Revised Date : 2014-10-16
  • Accepted Date : 2014-10-27
  • DOI :https://doi.org/10.12814/jkgss.2014.13.4.011
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