• 제목/요약/키워드: Reinforced Roadbed

검색결과 74건 처리시간 0.031초

대형반복삼축시험에 의한 강화노반 재료의 회복탄성계수 특성 분석 (Characteristics of Resilient Modulus of Reinforced-Roadbed Materials Using Large Repetitive Triaxial Test)

  • 임유진;이진욱;황정규;박미연
    • 한국철도학회:학술대회논문집
    • /
    • 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
    • /
    • pp.1115-1122
    • /
    • 2011
  • Reinforced-Roadbed materials are usually composed of crushed stones. Repeated load application can induce deformation in the reinforced-roadbed layer so that it causes irregularity of track. Thus it is important to develop a prediction model of elastic modulus based on stress-strain relation under repeatitive load in order to investigate behavior of reinforced roadbed. The prediction model of elastic modulus of the material can be obtained from repeated triaxial test. However, a proper size of the sample for the test must be used. In this study, a large repeatitive triaxial test apparatus with the sample size of diameter of 30 cm and height of 60cm was adapted for performing test of the crushed stone reinforced-roadbed considering large particle size to get resilient modulus Mr. The obtained resilient modulus was compared to shear modulus obtained from mid size resonant column test. The sample size effect is somewhat large enough so that it is required to design a scale factor based on similarity law in order to use smaller samples for getting elastic modulus of the crushed stone reinforced-roadbed material. A scale factor could be obtained from this study.

  • PDF

실 열차구간에서 측정된 강화노반재료별 궤도틀림 진행 평가 (Trend of the track irregularity with reinforced Railroad Roadbed materials measuring in Service Railroad line)

  • 최찬용;이지하;박창우;김성수
    • 한국철도학회:학술대회논문집
    • /
    • 한국철도학회 2007년도 춘계학술대회 논문집
    • /
    • pp.1833-1837
    • /
    • 2007
  • The railroad roadbed plays an important role in distributing and transferring the train loading to subgrade, preventing subgrade from bearing softened by providing appropriate stiffness for subgrade, and eventually supporting the track structures. Presently, the reinforced roadbed was widely constructed in high speed line and is proceeding a research about economical thickness and methodologies for the design of reinforced roadbed. Field test section is located at Kongbu line which is from Suwon to Pungtack. In this study, field test were measured a track irregularity with several types of reinforced roadbed materials by using Track Master. The field testing were conducted between March, 2006 and March, 2007.

  • PDF

강화노반재료별 장기 궤도틀림 진행 평가 (Trend of the Long-term track irregularity with Reinforced Railroad Roadbed materials)

  • 최찬용;이지하;박태환
    • 한국철도학회:학술대회논문집
    • /
    • 한국철도학회 2008년도 춘계학술대회 논문집
    • /
    • pp.281-285
    • /
    • 2008
  • The railroad roadbed plays an important role in distributing and transferring the train loading to subgrade, preventing subgrade from bearing softened by providing appropriate stiffness for subgrade, and eventually supporting the track structures. Presently, the reinforced roadbed was widely constructed in high speed line and is proceeding a research about economical thickness and methodologies for the design of reinforced roadbed. Field test section is located at Kyungbu line which is from Suwon to Cheonan In this study, field test were measured a track irregularity with several types of reinforced roadbed materials by using Track Master. The field testing were conducted between March, 2006 and April, 2008.

  • PDF

흙쌓기 구간에서 콘크리트궤도 강화노반의 두께 결정에 관한 연구 (Determination on the Reinforced Roadbed Thickness of Concrete Track at Embankment Section)

  • 이일화;이성진;신민호;황선근;이창진
    • 한국철도학회논문집
    • /
    • 제12권6호
    • /
    • pp.835-843
    • /
    • 2009
  • 최근 철도의 고속화 및 중량화로 인하여 보다 안정적인 토공노반 구조가 요구된다. 그 대안으로 강화노반이 도입되어 적용하고 있다. 하지만 현 설계기준에 적용되어진 콘크트궤도 강화노반의 강성 및 두께는 국내의 지반의 특성 및 공학적인 평가 없이 외국의 기준을 임의적이고 보수적으로 결정하고 있다 따라서 본 논문에서는 콘크리트궤도 흙쌓기 구간에서의 강화노반 두께를 합리적으로 결정하기 위하여 국내 시공조건을 고려, 적정 탄성계수, 배수성능, 동결심도, 경제성, 지지력 등을 검토하고 이를 바탕으로 유한요소해석을 실시하여 적정 두께를 제시하였다.

지오셀로 보강된 철도노반의 설계기법 개발에 관한 연구 (A study on Development of Design Method for Reinforced Railway Roadbed by Geocell)

  • 심재범;신민호;조삼덕;채영수
    • 한국철도학회:학술대회논문집
    • /
    • 한국철도학회 2002년도 추계학술대회 논문집(I)
    • /
    • pp.614-619
    • /
    • 2002
  • Since 1980's in U.S.A and Japan, the studies on increasing the bearing capacity of railway roadbed using geocell have been conducted for repair and reinforcement of railways constructed on soft soils. In this study, the railway roadbed system reinforced with geocells has been analyzed and investigated results of the previous studies were conducted in Korea and other nations, And the method for estimating the railway roadbed thickness was developed based on the equivalent method using the multi-layer theory and the deformation modulus Ev.

  • PDF

토목섬유로 보강된 철도노반의 설계기법 (A Design Method of Reinforced Railway Roadbed by Geosynthetics)

  • 심재범;채영수
    • 한국철도학회:학술대회논문집
    • /
    • 한국철도학회 1999년도 추계학술대회 논문집
    • /
    • pp.423-429
    • /
    • 1999
  • The design method of Geosynthetics reinforced Railway Roadbed that was developed in Germany in 1997 is presently putting into practice. This method insists that Railway Roadbed Thickness has to be measured by Frost and Bearing Capacity The Maximum Value from the above two measurements is the necessary Railway Roadbed Thickness. This design method has many kinds of advantage in economic, constructive aspect, and environmentalism. Recently a few Korean experts actively have researched on this area, but their results are not enough for proper design method. Ⅰ hope more complete study on this area will be progressed.

  • PDF

철도 강화노반재료의 정ㆍ동적 특성 분석 (Analysis of Static and Dynamic Characteristics of Reinforced Roadbed Materials)

  • 황선근;신민호;이성혁;이시한;최찬용
    • 한국철도학회논문집
    • /
    • 제3권1호
    • /
    • pp.34-41
    • /
    • 2000
  • The analysis of static and dynamic characteristics of reinforced roadbed materials was performed through model and laboratory tests. The strength characteristic of reinforced roadbed materials such as HMS-25 and soil were investigated through the unconfined axial compression test, the model soil box test and the combined resonant column and torsional shear test. The unconfined axial compression strength of HMS-25 shows a steady increasement in strength due to the chemical hardening reaction between HMS-25 and water. The result of model soil box test reveals that railroad roadbed of HMS-25 is better than that of soil in several aspects, such as, bearing capacity and settlement. The combined resonant column and torsional shear test result indicates that shear modulus of HMS-25 and soil increase with the power of 0.5 to the confining pressure and linear relationship to normalized shear modulus and damping ratio.

  • PDF

지오그리드로 보강된 철도노반의 침하 거동 (Settlement Behavior of Geogrid Reinforced Railroadbed)

  • 신은철;김두환;김남현
    • 한국철도학회:학술대회논문집
    • /
    • 한국철도학회 2000년도 춘계학술대회 논문집
    • /
    • pp.407-414
    • /
    • 2000
  • Recently the geogrids are being used in some large projects such as Inchon International Airport construction, highway construction, and Korean High-Speed Railway construction with not only the merit of simple construction but also reinforcing efficiency for the soft ground. Main function of roadbed is to provide a stable foundation in terms of bearing capacity and settlement for the subballast and ballsat layers. Differential settlement of the railroad should be avoided. The cyclic laboratory model tests were performed to investigate the settlement behavior of geogrid reinforced railroadbed. The ratio of settlement of roadbed under cyclic loading with three layers of geogrid reinforced is less than 1/2 of the roadbed thickness without reinforcement.

  • PDF

보강형 고화제를 이용한 친환경 도로노반조성 방안 (Construction of Environmentally Friendly Roadbed by Reinforecing Type Soil Solidification Agent)

  • 고용국
    • 한국지반공학회:학술대회논문집
    • /
    • 한국지반공학회 2004년도 춘계학술발표회
    • /
    • pp.667-671
    • /
    • 2004
  • The purpose of this paper is to study on the construction of environmentally friendly roadbed by reinforcing type soil solidification agent. The soil amendment agent used in this study is friendly to the environment, and has a function of soil-cement-agent solidification. The soil amendment agent was admixed with reinforced fiber material for enhancement of strength and durability of roadbed. The project of trial field test of roadbed construction with special reinforcing soil treatment agent was performed in Gyunggido on December 2003. A series of field and laboratory experiments including unconfined compressive strength, permeability were carried out to investigate the physical and mechanical characteristics of solidified roadbed treated by this reinforced solidifying agent. The results of this research showed that the roadbed using normal and poor soil could be efficiently constructed by treatment of this reinforcing type solidification agent admixed with fiber material.

  • PDF