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지진하중에 의한 토목섬유보강 성토지지말뚝구조의 수평변위
이일화(Il-Wha Lee),이수형(Su-Hyung Lee),이성진(Sung-Jin Lee) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.5
섬유보강 성토지지말뚝공법은 콘크리트궤도구간에서 합리적인 침하방지공법이지만, 구조체의 거동이 명확하지 않기 때문에 지진하중에 대한 상세한 안정성 검토가 요구된다. 본 논문에서는 섬유보강 성토지지말뚝구조의 지진응답에 대한 기초연구단계로서 각 위치별 수평변위특성을 평가하였다. 해석은 Hachinohe지진, Ofunato지진, 인공지진에 대하여 SHAKE를 사용한 등가선형 해석으로 연약지반의 지반응답 구하여 상용 유한요소 해석프로그램인 Abaqus를 이용하여 각 조건에 대한 수평변위특성을 검토하였다. 검토결과, 강성이 낮은 연약지반에 시공된 경우에 최대 수평변위가 32mm로서 다소 과도한 수평변위가 발생하는 것으로 나타났다. Geosynthetic-reinforced and pile supported structure method is very effective settlement restrain method on concrete track. However, because the behavior of the structure is not known, it needs detailed analysis for earthquake load. In the paper, the evaluations of a seismic performance of GRPS for a soft ground during earthquake were studied. The equivalent linear analysis was performed by SHAKE for soft ground parameters. The seismic analysis was performed by Abaqus using Hachinohe, Ofunato and artificial earthquake load. As a result, It found that excessive lateral displacement is happened up to 32mm when the GRPS is constructed on soft ground.
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),이성진(Lee Sung-Jin),이수형(Lee Su-Hyung),문인호(Moon In-Ho) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
Construction of high-speed concrete track embankments over soft ground needs many of the ground improvement techniques. 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, another measures should be considered. Especially, since the design criteria of residual settlement is limited as 30㎜ for concrete track embankment, it is very difficult to satisfy this allowable settlement by 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. In this paper, three cases with different embankment height and number of geosynthetic reinforcement, were studied through FEM analysis for efficient use of pile net method.
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.
토목섬유를 이용한 철도용 보강토교대의 배면토압 저감효과에 대한 실험적 연구
이일화(Il-Wha Lee),최원일(Won-Il Choi),조국환(Kook-Hwan Cho),이주공(Joo-Gong Lee),홍은수(Eun-Soo Hong),이강명(Kang-Myung Lee) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.11
기존의 교량-토공 접속구조의 단점을 보완하고 성능을 개선하기 위한 방안으로 토목섬유와 시멘트처리뒤채움재로 보강된 접속구조를 제안하고 실물가속실험을 이용하여 교대배면에 발생하는 수직 및 수평토압의 저감성능을 평가하였다. 제안된 접속구조는 토목섬유를 이용하여 어프로치블럭을 보강하는 보강토 교대의 일종으로서 재료는 시멘트처리된 흙자갈을 사용하여 유용토의 활용을 증대시키고 우수 침입을 저감시켰다. 실물가속실험 결과, 제안 보강토교대는 토압저감에 탁월한 효과가 있는 것으로 나타났다. Geosynthetic-reinforced transition structure is suggested to improve the performance of existing bridge-earthwork transition structure. The suggested transition which reinforcing the approach block using high-tension geotextile has a similar structure with the earth reinforced abutment. The used backfill material is cement treated soil and gravel. This material is reducing water intrusion into the approach block and increasing uses the surplus earth materials. As experiment is performed under the same condition to compare with the existing transition structure. Evaluation items are vertical and horizontal earth pressure acting on abutment. As results of real-scale accelerated testing, the suggested transition structure has excellent performance for the reduction of earth pressure and settlement.
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),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.