• Title/Summary/Keyword: Track roadbed

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

  • Choi, Chan-Yong;Lee, Jee-Ha;Park, Chang-Woo;Kim, Sung-Soo
    • Proceedings of the KSR Conference
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    • 2007.05a
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    • pp.1833-1837
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    • 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.

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

  • Choi, Chan-Yong;Lee, Jee-Ha;Park, Tae-Hwan
    • Proceedings of the KSR Conference
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    • 2008.06a
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    • pp.281-285
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    • 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.

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Theoretical Study for the Resonance Speed and Frequency in Roadbed on the Base Rock (암반상 토노반 구간에서의 공진 속도 및 주파수에 대한 이론적 연구)

  • Lee Il-Wha;Hwang Seon-Keun;Lee Su-Hyung;Choi Chan-Young
    • Proceedings of the KSR Conference
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    • 2005.11a
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    • pp.443-447
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    • 2005
  • When the high-speed train running on the track, there is a speed band which track distortion is unusually increased according to the condition of track and roadbed. This speed is called critical velocity and physical parameter value increased greatly. These phenomenon happened as high-speed train were developed, studied regularly through TGV 100 running test in France. As research result until now, the main reason is soft roadbed's capacity. Wave propagation and track support capacity is varied by the site characteristics. This paper achieved theoretical examination about resonance band(speed and frequency) that occurred in roadbed on the base rock in point of geotechnical engineering. The examination of resonance divides with ground response analysis, critical band analysis by the shear wave velocity of roadbed, train critical speed through the ground stratum.

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A Research on the Reinforced Roadbed Thickness of Concrete Slab Track on Embankment Section (콘크리트 슬래브 궤도 흙쌓기 구간의 강화노반 두께에 관한 연구)

  • Shin, Seung-Jin;Shin, Min-Ho;Park, Jong-Guan;Lee, Il-Wha
    • Proceedings of the KSR Conference
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    • 2007.11a
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    • pp.1242-1247
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    • 2007
  • An active application of concrete track is being expected for the future constructions of Korea railroad. For the successful construction and design in embankment section, the roadbed behavior should be reasonably estimated using the proper analysis method. In this research, behaviors of reinforced roadbed constructed with the determined stiffness and thickness at embankment section were estimated through various design parameters and numerical analysis. A three dimensional finite element method was employed to determine the proper reinforced roadbed thickness at embankment section. The displacement and vertical stress caused by train loading were estimated and compared with the field test results. The bearing characteristics of concrete track roadbed were presented. Moreover, the method to determine thickness of reinforced roadbed was proposed.

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Development of the Cement Mortar Grouting type Paved Track for Existing Line (기존선용 시멘트 모르터 충진형 포장궤도의 개발)

  • Lee Il-Wha;Lee Hee-Up;Lee Jun-Seok;Lee Jin-Wook
    • Proceedings of the KSR Conference
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    • 2005.11a
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    • pp.389-393
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    • 2005
  • When the high-speed train running on the track, there is a speed limit which track distortion is unusually increased according to condition of track and roadbed. This speed limit is called critical velocity, and physical parameter value increased very greatly. These phenomenon happened as high-speed train were developed, studied regularly through TGV 100 running test in France. As research result until now, the main reason is soft roadbed's capacity. Wave propagation and track support capacity is varied by the site characteristics. This paper achieved theoretical examination about resonance band(speed and frequency) that occurred in roadbed on the base rock in point of geotechnical engineering. The examination of resonance divides with ground response analysis, critical band analysis by the shear wave velocity of roadbed, train critical speed through the ground stratum.

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Characteristics of Behavior of the Soft Roadbed through Long-Term Instrumentation on the Field Test (운행선상의 연약노반 시험부설구간에서의 장기계측을 통한 거동 특성)

  • Lee Jin-Wook;Choi Chan-Yong;Lee Sung-Hyok;Lee Cnang-Youl
    • Proceedings of the KSR Conference
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    • 2004.10a
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    • pp.1058-1064
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    • 2004
  • As one of reinforcing methods for soft roadbed, the problems that mud-pumping and settlement occurred by soft roadbed, were investigated, evaluated and analyzed through installing relatively economical and efficient geosynthetics on the selected track-bed for testing. Mock-heang to Dong-ryang on the filed resting sections in the Chung-buk lines were selected as investigating the state of track and prepared field after selecting three of 1,700 spots which often make mud-pumping and requiting maintenance for that. Long curved line radiuses(R) of Mock-heang to Dong-ryang are 500m that were installed with 4 types of geosynthetics layers and one ballast layer. Installed testing cross-section is 200m totally with 40 m between places. Strength or prepared roadbed was measured to investigate the state of roadbed and track with constructing(installing) field testing sections and physical properties of roadbed soils were evaluated and analyzed. Also, mud-pumping, settlement of elastic or plastic sleeper, failure or track, wheel-loads, transverse and earth pressures were measured after installing field testing sections.

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A Study on the Applicability of the Reinforced Railroad Roadbed Method by Field Test (현장부설시험을 통한 철도 강화노반공법의 적용성에 관한 연구)

  • 황선근;신민호;이성혁;최찬용;이시한
    • Proceedings of the Korean Geotechical Society Conference
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    • 2000.03b
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    • pp.215-222
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    • 2000
  • The reinforced roadbed should have the ability to spread out the load intensity lower than the bearing capacity of the subgrade of track structure as well as to prevent the softening of roadbed by providing appropriate stiffness in the roadbed, thus fully supports the track structures. Full scale reinforced roadbeds with several different types of monotoring sensors was also constructed to evaluate the performance of each reinforced roadbed through the continuous monitoring while the train operation. In this study, Field tests such as PLT, SASW were also carried out at each reinforced roadbed. The results of the field and lab tests, installation and calibration of sensors, as well as construction condition of the reinforced roadbed are presented.

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A Study on Reinforcement Effectiveness for Railway Soft Roadbed by Using Geotextiles (토목섬유를 활용한 철도 연약노반에서의 보강효과)

  • Lee, Jin-Wook;Choi, Chan-Yong
    • Proceedings of the Korean Geotechical Society Conference
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    • 2005.03a
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    • pp.1546-1553
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    • 2005
  • In this study, geotextiles was applied on the selected track-bed, which is relatively economical and efficient way to prevent the problem of mud-pumping and settlement. Field testing sections from Mock-haeng to Dong-ryang in the Chung-buk lines in Korea were selected to investigate the state of track and roadbed. And three places were chosen among 1,700 spots where mud-pumping was frequently occurred and maintenance required. At the curved section with radius of 500m between Mock-haeng and Dong-ryang, we divided this testing site into 5 section and 4 different types of geotextile were installed and left the last section with no reinforcement. Total length of the test site was 200m and individual length of each site was 40 m. In order to understand the state and the strength of prepared roadbed, stiffness and physical properties of the roadbed soil were evaluated and analyzed. Also, after the installation, mud-pumping, settlement of elastic or plastic sleeper, failure of track, wheel-loads, lateral force and earth pressures were investigated.

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Determination Method of Reinforced Roadbed Thickness based on Design Chart (설계지표를 이용한 철도강화노반 두께 산정에 관한 연구)

  • Yoo, Chung-Hyun;Choi, Chan-Yong;Kim, Dae-Sang
    • Proceedings of the KSR Conference
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    • 2007.11a
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    • pp.1279-1286
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    • 2007
  • The purpose of a railway track is to provide a smooth surface for safe and economical train transportation. The performance of the track results from a complex interaction of the track and subgrade components in response to train loading and environmental actions. In the past, the role of subgrade as the track foundation were not recognized adequately. There are insufficient information and inadequate methods for subgrade design, assessment and improvement. This situation has survived for a long time largely because a subgrade defect can often be adjusted by adding more ballast under the ties or applying more frequent track maintenance. Therefore, the application of reinforced roadbed technology will be expected to increase in the future. The reinforced roadbed thickness is set depending on subgrade reaction modulus($K_{30}$) in the condition of upper subgrade through PBT in both conventional railroad and KTX railroads. As train velocity (V), train passing tonnage (N), and train axial load (P) are not considered in design, the roadbed thickness could be overestimated (or underestimated). Therefore, in this study has proposed a determination method of reinforced roadbed thickness using design chart made by resilience modulus and properties of earthwork materials.

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Study on the Resonance in Trackbed of High-Speed Railway Considering Ground Condition (지반조건에 따른 고속철도 토공노반의 공진에 관한 연구)

  • Lee, Il-Wha;Hwang, Seon-Keun;Choi, Chan-Young
    • Proceedings of the Korean Geotechical Society Conference
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    • 2006.03a
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    • pp.1320-1325
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    • 2006
  • When the train running on the high-speed track, there is a speed band which track distortion is unusually increased according to the condition of track and roadbed. This speed is called critical velocity and physical parameter values are increased greatly. These phenomenon happened as high-speed train were developed, studied regularly through TGV 100 running test in France. As research result until now, the main reason is soft roadbed's bearing capacity. Wave propagation and track support capacity is varied by the ground characteristics. This paper achieved theoretical examination about resonance band(speed and frequency) that occurred in roadbed on the base rock in point of geotechnical engineering. The examination of resonance divides with ground response analysis, critical band analysis by the shear wave velocity of roadbed and train critical speed through the ground stratum.

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