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콘크리트궤도 침하복원을 위한 궤도/노반 인터페이스부 그라우팅이 주행안정성에 미치는 영향
이일화(Lee Il-Wha),이성진(Lee Sung-Jin),이태균(Lee Tae-Guen),강태호(Kang Tae-Ho) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Various design factors should be considered in order to apply the concrete slab track system on the soil/rock roadbed. One of the important factors is the settlement of roadbed. This settlement of concrete track should be supervised under the allowable settlement limit. If the settlement of roadbed under the concrete track exceed the allowable limit, the train serviceability will considerably come down and furthermore the fatal disaster may happen. Therefore, in this paper we introduced a digitalized grouting method as a settlement restoration method that can be suitably adopted to the concrete slab track. And we also evaluated the train service stability through the analysis of the track behavior according to the difference of the stiffness between the grouted part and the original roadbed.
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.
이일화(Lee Il-Wha),이성진(Lee Sung-Jin),이수형(Lee Su-Hyung),방의석(Bang Eui-Seok),정장용(Jung Jang-Yong) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
The problems associated with constructing high-speed concrete track embankments over soft compressible soil has lead to the development and/or extensive use of many of the ground improvement techniques used today. Drains, surcharge loading, and geosynthetic reinforcement, have all been used to solve the settlement and embankment stability issues associated with construction on soft soils. However, when time constraints are critical to the success of the project, owners have resorted to another innovative approach. Especially, the design criteria of residual settlement is limited as 30mm for concrete track embankment, it is very difficult to satisfy this standard using the former construction method. Pile net method consist of vertical columns that are designed to transfer the load of the embankment through the soft compressible soil layer to a firm foundation and one or more layers of geosynthetic reinforcement placed between the top of the columns and the bottom of the embankment. This paper will present the guidelines for the design of pile net method to supported embankments. These guidelines were developed based on a review of current design methodologies and a parametric study of design variables using numerical modeling.
침하 억제를 위하여 초연약지반에 설치된 섬유보강 성토지지말뚝의 내진성능 평가
이일화(Lee Il-Wha),강태호(Kang Tae-Ho),이수형(Lee Su-Hyung),이성진(Lee Sung-Jin),방의석(Bang Eui-Seok) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
The problems associated with constructing high-speed concrete track embankments over soft compressible soil has lead to the development and/or extensive use of many of the ground improvement techniques used today. Drains, surcharge loading, and geosynthetic reinforcement, have all been used to solve the settlement and embankment stability issues associated with construction on soft soils. Geosynthetic-reinforced embankment supporting piles method consist of vertical columns that are designed to transfer the load of the embankment through the soft compressible soil layer to a firm foundation and one or more layers of geosynthetic reinforcement placed between the top of the columns and the bottom of the embankment. In the paper, the evaluations of a seismic performance of geosynthetic-reinforced embankment piles for a ultra soft ground during earthquake were studied. the equivalent linear analysis was performed by SHAKE for soft ground. A seismic performance analysis of Piles was performed by GROUP PILE and PLAXIS for geosynthetic-reinforced embankment piles. Guidelines is required for pile displacement during earthquake. Conclusions of the studies come up with a idea for soil stiffness, conditions of pile cap, pile length and span.
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.