직육면체 섬유보강재 노반보강공법 현장부설에 따른 지지력 평가 비교분석

Comparative Analysis of Support Stiffness Based on On-Site Laying of Rectangular Parallelepiped Fiber Reinforcement Sack

직육면체 섬유보강재를 이용한 노반보강공법은 친환경적이며 기존 노반 보강 기술의 단점을 보완한 공법이다. 실대형 시험을통하여 열차 속도에 따른 지지력 향상 효과, 안정성 및 시공성이 검증되었다. 검증된 자료를 바탕으로 자갈의 세립화, 뜬침목및 침목균열이 발생한 기존선 구간에 직육면체 섬유보강재를 부설하였다. 노반의 기본 물성시험을 실시하였으며, 보강단면과비보강단면의 현장부설에 따른 침하량을 비교·분석하였다. 직육면체 섬유보강재 부설 후 열차운행에 따른 침하량을 비교분석한결과, 레일 및 침목의 수직 변위량이 최대 84% 감소되었다. 이는 직육면체 보강재의 보강효과로 인해 궤도 지지력이 향상되어궤도의 안정성을 향상시키는 것으로 나타났다.

The roadbed reinforcement method, in which a rectangular parallelepiped fiber reinforcement sack is used, is ecofriendly and overcomes the disadvantages of the conventional roadbed reinforcement method. Through large-scale tests, the effects of improving the bearing capacity, stability, and constructability according to the train speed were confirmed. Physical property investigations of the field test were conducted to analyze the conditions of the roadbed. The settlement degree of the site, where the reinforced section and unreinforced section were placed, was measured and analyzed. A rectangular parallelepiped fiber reinforcement sack was laid. Based on the physical properties determined during the field tests, this section was found to be soft ground composed of silt sand with a low bearing capacity. In addition, through comparison and analysis of the degree of settlement caused by the laying of rectangular parallelepiped fiber reinforcement sack, the dynamic vertical displacement of rails and sleepers decreased by at least 84%. It was shown that the track stability improved when the rectangular-parallelepiped fiber reinforcement sack was laid, which reduced the dynamic behavior along and improved the track support.