열차 충격하중 재하 시 침목 패드의 도상층 침하 저감 효과
Settlement reduction effects at ballasted layer of sleeper pad under train impact load
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초록
침목 저면에 부착하는 패드는 열차하중에 의한 충격하중을 효과적으로 저감할 수 있는 방법중의 하나이다. 본 연구에서는 재하판의 자유낙하 높이에 따라 충격하중 조절이 가능하고 반복재하가 가능한 충격하중 재하시험기를 새롭게 제작하여 도상층에 대한 충격하중 반복재하시험을 수행하였다. EPDM 고무패드가 부착된 침목과 미부착 침목을 고려한 충격하중 시험결과를 비교 분석한 결과, 부착한 경우에서 충격하중이 24% 저감하여, 결과적으로 도상층 침하 56% 자갈 파쇄도가 40% 수준으로 저감하는 것으로 나타났다.
Abstract
The USP (Under Sleeper Pad) is one of methods to effectively reduce impact loads occurred from train loading. In the study, the repeated impact load is applied to the ballasted layer with newly developed impact load tester, which can control the impact load according to the free fall height of load plate with weight. In cases EPDM (Ethylene-Propylene Diene Monomer) rubber sleeper pad is attached to the load plate, settlement of ballasted layer is reduced by 56%, gravel breakage by 40% with the impact load decrease by 24% as compared without EPDM rubber sleeper pad.
참고문헌 (10)
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