Abstract

새로운 노선에 대한 철도 건설의 증가와 함께 운행 중인 노선의 운행속도 향상 등이 많이 실시되고 있다. 이를 위해서 철도 선형의 직선화를 필요로 하게 되며, 직선화된 철도는 지반조건이 불리한 경우라도 종래와 같이 우회 등이 불가능하게 되는 설 계를 초래 할 수밖에 없게 된다. 국내에서 연약지반이 상대적으로 많이 분포하고 있는 남해안이나 서해안을 따라 시공되고 있거나 설계되고 있는 철도는 철 도노반 시공 후 지속적인 침하가 발생할 가능성이 크며 이러한 경우 열차운행의 안정성에 큰 영향을 미치게 된다. 국내철도의 궤도구조는 경부고속철도 2단계 시공을 기점으로 많은 선로가 자갈도상 구조에서 콘크리트궤도 구조로 바뀌게 되 었다. 이중 콘크리트궤도 구조는 열차하중 부담력 및 저항력이 크기 때문에 궤도틀림이 거의 발생되지 않아 궤도 유지·보수비 Abstract Concrete slab track was applied to the Gyeoungbu High Speed Railroad step 2 and the Honam High Speed Railroad. Concrete slab track incurs higher construction cost and lower maintenance cost than existing gravel track. For these reasons, the use of concrete slab track has increased in Korea. The biggest problem in the use of concrete slab track is repairing damage from settlement that can occur while trains are in service. High speed railroad design standards require allowable residual settlement of concrete slab track of less than 25mm. In order to satisfy the requirement of long term stability of concrete slab track, it is necessary to manage the secondary compression settlement within the allowable residual settlement. This study is to evaluate the secondary compression settlement with the variation of the secondary compression index, thickness of soft ground, and concrete slab track life. Statistical analysis is performed to determine the probability of distribution of areas where serious problems will be caused after the concrete slab track is constructed.

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