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도시철도 시험선 구간에서의 포장궤도 시험부설 및 성능평가
이일화(Lee Il-Wha),심재규(Shim Jae-Gyu),이춘호(Lee Choon-Ho),박균서(Park Kyun-Seo),류경식(Ryu Kyoung-Sik) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
Recently, the development of the paved track is required as a low-maintenance of conventional line. The main reason is that the line capacity and bearing of track are increased progressively. The important factors of paved track are stability and applicability. To be based on this subject, Cement Mortar Pouring(CMP) paved track is developed. CMP paved track is a kind of ballast reinforced track using the prepacked concrete technique. The most important thing to design the paved track is to optimize the track structure considering various conditions. In this study, the CMP track is constructed(30m) on a test line and the track performance tested by running train to evaluation the capability and workability. The track performance are tested to confirm the vibration acceleration of the car body, wheel and track, accumulated settlement, track irregularity and crack of surface.
이일화(Lee il-wha),이진욱(Lee jin-wook),이수형(Lee su-hyung),이현석(Lee hyun-suk) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
Recently, the development of the paved track is required as a Low-maintenance of conventional line. The main reason is that the line capacity and bearing of track are increased progressively. The most important factor of paved track is stability and applicability. To be based on this subject, Cement Mortar Pouring(CMP) paved track is developed. CMP paved track is a kind of ballast reinforced track using the pre packed concrete technique. The most important to design is characteristics of the structure. CMP slab"s thickness is less than the conventional slab track and pouring layer is attached tie and roadbed directly. On this paper, to verify the basic structure of the CMP track, characteristics of the structure is investigated pouring layer, tie and interaction of the each layer using the 3D finite element analysis.
이일화(Lee Il-Wha),황선근(Hwang Seon-Keun),박태순(Park Tae-Soon),이보형(Lee Bo-Hyoung),고학송(Ko Hak-Song) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
Recently, the development of paved track is required as a Low-maintenance of conventional line. The most important factor of paved track is stability and applicability. In this method, the ballast is grouted with mortar so that the ballast can tum into a structure like slab. This method can be subdivided into the followings. One is the method with switching the ballast, and the other is without switching the ballast. The ordinary and actual states of the ballast and roadbed were investigated to evaluate the applicability of the paved track structure in this study, and various In-situ tests were applied. Non-destructive tests such as GPR, SASW, FWD were used, and bearing capacity of roadbed, depth of the ballast, and deterioration, penetration, and contamination of the ballast were focused. The result of this investigation was utilized in the selection of optimal paved track structure and data for preliminary design.
이일화(Il-Wha Lee),이성진(Sung-Jin Lee),이수형(Su-Hyung Lee),진정운(Jeong-Un, Jin) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
콘크리트궤도가 도입됨에 따라 토공노반에서의 잔류침하 억제가 중요한 사안으로 대두되고 있다. 호남고속철도에서는 연약지반구간의 침하억제를 위하여 국내에서 최초로 파일슬래브공법을 본선 940m 구간에 적용하였다. 적용된 파일슬래브구조는 침하억제를 목적으로 슬래브는 성토하중을 분산하고 파일은 분산된 하중을 지지층까지 직접 전달시켜 충분히 지지력을 확보하여 침하를 방지한다. 파일슬래브구조는 구조물 기초와 동일한 하중전달 메카니즘을 가지고 있기 때문에 철도노반에서의 침하억제 성능도 매우 우수하지만, 성토고가 높아지거나 연약지반의 심도가 깊어질 경우에는 경제성에서 불리한 단점도 있다. 본 논문에서는 파일슬래브가 설치된 철도노반에서 약 700 일간의 계측 결과를 바탕으로 침하억제성능을 평가하고자 하였다. 지반특성 및 시공공정을 고려하여 원지반침하계 및 지표침하계의 계측결과를 중심으로 침하특성을 평가하고 향후 공용기간 동안의 침하량을 예측하여 파일슬래브공법의 침하억제성능을 평가하고자 하였다. Pile-slab method had been applied to Homan high-speed railway as 940m at first. The purpose of pile-slab structure is to restrain the soft ground settlement within design criteria. The slab distribute embankment load horizontal direction and the pile transfer to bedrock vertical direction. In this present paper, it evaluate settlement restrain performance during 700days using field data on high-speed railway roadbed which applied pile-slab structure. Settlement characteristics is evaluated with field data which are measured on natural ground and top of embankment considering the soil condition and construction process. Also, the settlement prediction is performed using a square root, Askaoka and hyperbolic curve during 60 years.
저탄성 베이스플레이트 패드 적용에 따른 포장궤도 노반에서의 전달하중 저감에 관한 연구
이일화(Lee Il-Wha),강윤석(Kang Yun-Suk),이희업(Lee Hee-Up) 대한토목학회 2008 대한토목학회논문집 D Vol.28 No.3D
포장궤도는 기존선의 유지보수 노력을 절감하기 위하여 개발되고 있다. 이 중 베이스플레이트 저탄성패드는 궤도 전체의 지지강성을 결정하는 구성품으로서 궤도의 응력-변위특성 동적응답, 피로특성 등에 가장 큰 영향을 미친다. 따라서 저탄성패드의 적용은 궤도전체의 내구성과 안정성에 미치는 영향이 크다고 할 수 있다. 본 논문에서는 저탄성패드의 적용으로 인하여 획득되는 효과 중 노반에 전달되는 열차하중의 저감에 대한 연구를 수행하였다. 이를 위하여 패드스프링계수별 정적해석과 실물반복재하시험을 수행하고 그 결과를 비교 분석하여 저탄성패드의 하중 전달특성을 파악하였으며 전달하중 저감효과를 검토하였다. Development of the paved track is required as a low-maintenance of conventional line. The paved tracks are one of the types of the ballast reinforced tracks those are manufactured by adopting the prepacked concrete technique. The main elements of this tracks are large sleeper, low elastic pad, fastener, cement mortar, geotextile and recycled ballast. Low elastic pad is the most effective element of such tracks on the basis of stress-displacement characteristics, dynamic response and fatigue characteristics. The stiffness of the pad determine the stiffness of the track. Consequently, it is more important in case of concrete track structure such as paved track because application of low elastic pad seriously effect the durability and stability of the track. The main objective of this study is to confirm the reduction of train load, which transfer to roadbed through various pad effects. To achieve this task static, numerical analysis and real scale repeated loading test was performed while load reduction effect of low elastic pad was analyzed by using displacement, stress and strain ratio characteristics of the paved track.
이일화(Il-Wha Lee),윤원민(Won-Min Yun),최원일(Won-Il Choi),황인환(In-Hwan Hwang),황성욱(Sung-Wook Hwang) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
The vibration resulting from railway operation is transmitted through the track and line structure ground movements to adjacent buildings. As these vibration is growing there is occurred exaggerated forces and displacements of the track and line structure and it is causing the differential settlement. It is difficult to clarify the dynamic response characteristics of trackbed because of various environmental conditions. However track irregularity be affected by ununiformed bearing capacity and its dynamic response study for dynamic response characteristics is required to investigate the cause of track irregularity and countermeasure. This study was intended to evaluate the numerical analysis which exam the response analysis characteristic of ground vibration by shape of cutting and embankment transition zone. The original method of analysis were have to examine variables such as directions angles drain conditions linear conditions. However In the analysis there were to consider the effect of moving loads according to directions of cutting and embankment transition zone.