아스팔트 및 강화노반의 두께 변화에 따른 아스팔트 직결궤도의 내구수명 평가 기초연구

초록

Directly fastened asphalt track is easy to secure flatness and possible to construct quickly without any special filler layer. It also has an advantage of maintaining and repairing immediately in case of track loss or settlement. Directly fastened asphalt track (ATD track) between Berlin and Hanover in Germany is reported that its maintenance has been unnecessary for 20 years after construction. The track is also noted for its excellence of noise reduction. Directly fastened asphalt track transfers train load directly to asphalt roadbed through sleepers or panels. According to the thickness of asphalt concrete layer, therefore, the stress acting on upper roadbed and the strain of lower asphalt roadbed are expected to have a big effect on its design life. In this respect, this paper focused on the effect of the asphalt and reinforced roadbed layer thickness on reinforced roadbed and the evaluation of its service life using currently available wider sleepers for directly fastened asphalt track.