• Title, Summary, Keyword: 노반설계기준

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Evaluation on the Applicability of the Conventional Roadbed Stiffness for High Speed Concrete Track (일반철도 노반 강성조건에서의 고속철도용 콘크리트 궤도의 적용성 검토)

  • Lee, Jin Wook;Lee, Seong Hyeok;SaGong, Myung;Lyu, Tae Jin
    • Journal of the Korean Society for Railway
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    • v.16 no.1
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    • pp.40-46
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    • 2013
  • Based on Korean railway design standards, the thicknesses of the reinforced roadbeds of conventional and high speed railways are different, and so too, for the size distribution of the ballast particles. Accordingly, considerable cost would be required to increase operating speeds of conventional lines, in particular related to changing from a ballasted track system to a ballastless one. In this study, applicability of a roadbed which supports conventional ballasted track, for use as a ballastless track for a high speed rail line was examined. A reinforced roadbed for a conventional railway is 20cm thick, and the type of material used for a conventional reinforced roadbed is M-40 (crushed gravel for road embankments). A dynamics test was conducted to evaluate the occurrence of the permanent settlement of the track substructure. These results suggest that, without changes to the track substructure, an operational speed of 400km/h is feasible with a ballastless track. This result; however, is from laboratory experiments. Further studies, such as numerical analyses or field validation, are required.

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

  • Lee, Il-Wha;Lee, Sung-Jin;Sin, Min-Ho;Hwang, Sun-Kun;Lee, Chang-Jin
    • Journal of the Korean Society for Railway
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    • v.12 no.6
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    • pp.835-843
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    • 2009
  • Recently the more stable roadbed is required due to the high speed and design load. Therefore the reinforced roadbed was introduced as the solution. But the thickness and stiffness of reinforced roadbed in design code is being conservatively assessed by the foreign code without considering the domestic construction condition. In this paper, adequate Young's modulus, drain capacity, freezing depth, economical efficiency, bearing capacity, construction condition and 3-D finite element method were employed to determine the proper thickness of reinforced roadbed at the embankment section.

Optimal Section of Ballasted Asphalt Track Considering Design Lifetime and Economic Feasibility (설계수명 및 경제성을 고려한 유도상 아스팔트 궤도의 최적 단면 산정)

  • Lee, Seonghyeok;Lee, Jinwook;Lee, Hyunmin
    • Journal of the Korean Society for Railway
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    • v.18 no.3
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    • pp.241-251
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    • 2015
  • Compared with ballasted track (BT), ballasted asphalt track (BAT) has been increasingly adopted in many countries due to its more greatly reduced reinforced roadbed thickness and smaller cumulative plastic deformation, and its advantages in terms of maintenance. In this respect, the authors' previous research includes analysis of BAT sections that show performance similar to that of BT sections of the present specifications; reliability verification of the analysis results through real-sized static and dynamic train-load tests were performed. Based on previous research, this paper estimates the track lifetime using the strain of the lower roadbed according to reinforced roadbed thickness; using probabilistic LCC analysis, this paper presents a BAT section that satisfies the design lifetime and that has performance similar to or higher than that of BT.

Development of Design Method for Reinforced Roadbed Considering Plastic Settlement for High-speed Railway (고속철도에서의 소성침하를 고려한 강화노반 설계기법 개발)

  • Choi, Chan-Yong;Choi, Won-Il;Han, Sang-Jae;Jung, Jae-Hyun
    • Journal of the Korean Geotechnical Society
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    • v.29 no.9
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    • pp.55-69
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    • 2013
  • An alternative design method of existing methods based on elastic theory the design method of roadbed considering plastic deformation of roadbed and stress-strain at roadbed materials with the cyclic loading of trains passing. The characteristics of the developed design method considering traffic load, number of cyclic loading and resilience modulus of roadbed materials can evaluate elastic strain as well as plastic settlement with allowable design criteria. The proposed design method is applied to standard roadbed section drawing of HONAM high-speed railway considering design conditions such as allowable elastic and plastic settlement, train speed, the tonnage of trains. As a result, required levels of resilience modulus model parameter ($A_E$), unconfined compressive strength, types of soil material were evaluated.

A Study on the Criteria of Settlement in Concrete Slabtrack (토노반상 콘크리트궤도의 노반허용침하기준설정에 관한 연구)

  • Hong, Chul-Kee;Yang, Shin-Chu;Kim, Yun-Tae
    • Journal of the Korean Society for Railway
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    • v.10 no.3
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    • pp.355-364
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    • 2007
  • Recently a concrete slab tracks are being constructed on roadbed in the Gyoeng-bu 2nd phase high speed railways. In respdnding to this trend, new design standards and track materials maintenance systems, based on the slab track material safety and usage perspective, are needed. This research provides a roadbed design criteria and the maintenance system. The proposed roadbed design criteria and the maintenance system are based on the developed analysis meathod of train/slab-track interaction. where the roadbed settlement and train speed are utilized as mediating variables. In the analysis, the dynamic response of train/slab-track interaction apply to various speeds and settlements. the roadbed settlement is shown in a sinusoidal shape of wave, the scope of the settlement occurrence presented in its wavelengths, include 6meters, 10meters, 15merwes, 20meters, 30meters. The train speeds involved are 50, 100, 150, 200, 250, 300, 350, 400kilometers per hour.

Case study on the treatment of soft soil ground in railroad sites (철도 현장의 연약지반 처리에 대한 사례연구)

  • Kim, Joon-Seok
    • Proceedings of the Korean Society of Disaster Information Conference
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    • pp.239-240
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    • 2017
  • 철도노반 현장의 저성토구간의 연약지반구간에 대하여, 성토높이 3m 이내인 저성토구간의 경우 열차하중에 따른 연약지반의 처리를 어떻게 하는 것이 향후 재난발생을 예방할 수 있는지에 대하여 설계기준 원문을 대상으로 적용방법에 대한 분석을 실시하였다.

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Laboratory Test for Permanent Settlement Behavior of Geo-materials used in Railway Considering Grain size distribution and Water content (입도 및 함수비 조건에 따른 철도 노반 재료의 영구침하거동 요소시험평가)

  • Lee, Sung Jin;Lee, Il Wha;Lee, Su Hyung;Eum, Ki Young
    • Journal of the Korean Society for Railway
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    • v.18 no.4
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    • pp.354-362
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    • 2015
  • Since allowable settlement of concrete slab track is about 30mm, a lot of attention must be paid to the settlement of the earthwork (reinforced trackbed, upper subgrade, under subgrade) under the concrete track. To this end, more experimental data should be accumulated through tests for these materials. In this study, we evaluate the long-term settlement of reinforced trackbed and subgrade materials using factors such as repeated loading conditions, water content, and grain size distributions in a large triaxial test and a large oedometer test. In cases in which the performance of the reinforced trackbed layer meets the design criteria, the settlement caused by train load was considerably small. But, when the water content increases in the subgrade, unexpectedly large settlement might occur for certain grain size distributions of the subgrade materials.

A Study on Basic Properties of the Reinforced-roadbed Material Using Water Quenched Blast Furnace Slag (수재슬래그를 이용한 강화노반재료의 기초적 특성 연구)

  • 이선복;윤지선
    • Journal of the Korean Geotechnical Society
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    • v.19 no.1
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    • pp.103-110
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    • 2003
  • The development of reinforced-roadbed material in substitute for existing roadbed is necessary to protect its failure from the dynamic stress and vibration caused by the traveling of the high-speed and heavy trains. The water quenched blast furnace slag having potential hydraulic reactivity is one of the materials in substitute for soil reinforced-roadbed. We carried out the study of basic properties of roadbed material using Portland cement and CSA(calcium sulphoaluminate) as the activator for the evaluation of its application. As the result of the strength test, this material satisfied design criterion for reinforced-roadbed. Optimum mixing ratio of this reinforced-roadbed material was 15 ~ 17.5 percent of cement and 2.5 percent of CSA by weight of the blast furnace slag. Especially, as permeability is above $10^{-3}$cm/sec, this material proved to have functions of both reinforced roadbed and drainage layer.