토목섬유 시스템을 활용한 철도노반의 보강효과 및 설계기법 개발에 관한 연구 = A study on reinforcement effectiveness and development of design method for railway roadbed by geosynthetics system

다국어 초록 (Multilingual Abstract)

Most railways in Korea have been constructed and operated before 1900's, as which, the existing railways and related structures need repair, reinforcement, and extension in capacity and deterioration problem. Such traditional methods as replacement or improvement of soft soils have been utilized for the repair, reinforcement, and extension of the railway roadbed; however, the methods involve many problems in construction, economy, and environmental adaptation.
Since 1970's in Japan, Germany, and U.S.A., the studies on increasing the bearing capacity of railway roadbed using geosynthetics system have been conducted for the repair, reinforcement, and extension of railways constructed on soft soils. And the unique and appropriate design method and specification for ech nation, regarding the railway roadbed system, have been determained and being used.
Lately, in Korea, several methods for reinforcing railway roadbed using geosynthetics system have been studied as a part of the development of the high-speed train technology. These studies, however, is yet in early stage and focus on the development of the method for the railway roadbed reinforcement for high-speed train rather than the application for maintenance, repair, and extension of the existing railways. Moreover, in the studies, the tnickness of the railway roadbed is estimated using the subgrade reaction modulus K_30 and the deformation modulus Ev obtained from plate load test. but the estimation of the railway roadbed thickness using the subgrade reaction modulus K_30 is not generally reasonable for the combined ground system such as the railway roadbed reinforced with geosynthetics.
In this study, the railway roadbed system reinforced with geosynthetics, widely used for the repair, reinforcement, and extension of existing railways in Korea, has been analyzed and investigated using finite element method and the results of the previous studies conducted in Korea and other nations. and the method for estimating the railway roadbed thickness was developed based on the equivalent method using the multi-layer theory and the deformation modulus Ev.
The char, developed in this study, for estimating the railway roadbed thickness reinforced with geosyntheties involves the defect not reflecting the test data measured in field; therefore, the long-term measurement o the test section constructed in field and further studies are needed for developing more accurate method and chart.

목차 (Table of Contents)

• 목차
• Abstract = i
• List of Figures = vi
• List of Tables = xiii
• 기호 = xvi
• 제1장 서론 = 1
• 1.1 연구배경 및 목적 = 1
• 1.2 연구내용 및 방법 = 4
• 제2장 철도구조물에서 토목섬유 시스템의 적용 및 설계기법 = 8
• 2.1 개요 = 8
• 2.2 선로의 구성 = 8
• 2.3 선로파괴의 원인 및 형태 = 10
• 2.4 토목섬유 시스템의 적용 사례 = 16
• 2.5 토목섬유 시스템을 이용한 노반강화 방법 = 29
• 2.6 토목섬유 시스템으로 보강된 철도노반의 설계기법 = 39
• 2.6.1 철도에서의 노반의 설계기법 분석 = 39
• 2.6.2 독일 국영철도(DB AG)의 철도노반 설계방법 = 49
• 2.6.3 토목섬유 시스템으로 보강된 철도노반의 설계기법 = 53
• 2.6.4 열차하중에 의한 응력산정방법 = 54
• 제3장 철도 노반제로서 토목섬유 시스템의 적합성 평가 = 59
• 3.1 기본원리 및 평가방법 = 59
• 3.1.1 기본원리 = 59
• 3.1.2 평가방법 = 61
• 3.2 현장시험 및 방법 = 61
• 3.2.1 현장시험 = 61
• 3.2.2 현장시험 방법 = 65
• 3.3 실험재료의 특성 = 72
• 3.3.1 실험대상 흙시료 = 72
• 3.3.2 실험대상 토목섬유 = 75
• 3.4 토목섬유 시스템의 메카니즘 분석 및 지지력 평가 = 78
• 3.4.1 토목섬유 시스템의 메카니즘 분석 = 78
• 3.4.2 토목섬유 시스템의 지지력 개선효과의 분석 = 96
• 3.4.3 토목섬유 시스템의 지지력 개선효과의 평가 = 117
• 제4장 동적 모형토조실험에 의한 토목섬유 시스템의 효과 분석 = 125
• 4.1 시험개요 = 125
• 4.2 토목섬유 시스템의 동적 모형토조실험 = 129
• 4.2.1 지오그리드 시스템의 동적 모형토조실험 = 129
• 4.2.2 지오셀 시스템의 동적 모형토조실험 = 135
• 제5장 유한요소해석(FEM)에 의한 토목섬유의 보강효과 분석 = 140
• 5.1 해석에 사용된 기본 특성치 = 140
• 5.2 해석조건 및 방법 = 142
• 5.3 해석조건별 응력 분포 = 144
• 5.4 해석조건에 따른 변위의 관계 = 146
• 제6장 토목섬유 시스템을 이용한 철도노반의 설계기법 개발 = 152
• 6.1 개요 = 152
• 6.2 열차하중 및 노반중 상부면에 작용하는 응력의 계산 = 154
• 6.3 토목섬유 시스템으로 보강된 철도노반의 설계 기법 개발 = 156
• 제7장 결론 = 170
• 부록 = 173
• 참고문헌 = 205