직육면체 섬유보강재 노반보강공법 현장부설에 따른 자갈궤도 동적거동 비교분석

Study of Ballast Track Dynamic Behavior Evaluation Comparative Analysis According to the On-Site Laying of Rectangular-Parallelepiped Fiber Reinforcement Sack

직육면체 섬유보강재를 이용한 노반보강공법은 다양한 기존 노반 보강 기술의 단점을 보완한 공법이다. 자갈의 세립화;뜬침목 및 침목균열이 발생한 기존선 oo구간에 직육면체 섬유보강재를 부설하였다. 상부노반의 기본 물성시험을 실시하였으며;보강단면과 비보강단면의 열차 운행에 따른 레일과 침목의 수직변위;수직 가속도를 비교⋅분석하였다. 직육면체 섬유보강재 부설 후 열차운행에 따른 수직 변위 및 가속도를 비교 분석한 결과;수직 변위량은 최대 84%;수직가속도는 최대 80% 감소되었다. 이는 직육면체 보강재의 보강효과로 인해 레일의 동적 움직임이 감소되어 노반 지지력 향상과 안정성이 향상된 것으로 나타났다.

The roadbed reinforcement method using cuboidal fiber reinforcement is an eco-friendly method that compensates for the shortcomings of various existing roadbed reinforcement technologies. A rectangular parallelepiped fiber reinforcement was installed in section oo of the existing line where fine-grained gravel;floating sleepers;and sleeper cracks occurred. The basic physical property test of the upper subgrade was conducted;and the vertical displacement and acceleration of rails and sleepers were compared and analyzed according to the train operation of the reinforced and non-reinforced sections. A comparative analysis of the vertical displacement and acceleration according to train operation after laying the rectangular parallelepiped fiber reinforcement demonstrated that the vertical displacement and acceleration were reduced by up to 84% and 80%;respectively. The dynamic movement of the rail was reduced owing to the reinforcing effect of the rectangular parallelepiped reinforcement;thereby improving the roadbed bearing capacity and stability.