Journal of the Korean Society for Railway (한국철도학회논문집)

The Korean Society for Railway (한국철도학회)
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Dynamic Properties for Geomaterials of Railway as Determined by Large-scale Cyclic Triaxial Test

대형삼축압축시험을 이용한 철도노반재료의 동적 물성 제안

  • Lee, Sung Jin (High-speed Railroad Systems Research Center, Korea Railroad Research Institute) ;
  • Hwang, Su Beom (High-speed Railroad Systems Research Center, Korea Railroad Research Institute) ;
  • Lee, Su Hyung (Metropolitan Transportation Research Center, Korea Railroad Research Institute) ;
  • Lee, Seong Hyeok (High-speed Railroad Systems Research Center, Korea Railroad Research Institute) ;
  • Kim, Ki Jae (High-speed Railroad Systems Research Center, Korea Railroad Research Institute)
  • Received : 2013.07.23
  • Accepted : 2013.12.02
  • Published : 2014.02.28
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Abstract

In the earth structures of railways, large coarse granular materials are widely used as fill materials. However, experimental studies that consider the dynamic properties of these coarse granular materials have rarely been carried out in Korea due to the lack of a large scale test apparatus in this country. In this study, large scale cyclic triaxial tests were carried out for materials such as reinforced roadbed (subballast, graded crushed stone), transition zone gravel, and the upper subgrade of a railway. These specimens were prepared according to certain conditions (dry unit weight, grain size distribution, and so on) specified in the Korea railroad design standard. Based on these large triaxial test results, normalized shear modulus and damping ratio curves according to small strain level are suggested. A model and coefficients for each material are also proposed.

철도에서 토공구조물은 입경이 큰 조립지반재료를 주요한 재료로 사용하고 있다. 그러나 이들 재료에 대한 미소변형 거동을 평가할 수 있는 동적물성 산정에 대한 연구는 대형시험장비의 부족으로 거의 이루어지지 않고 있다. 이에 본 연구에서는 국내 철도설계기준에 제시되어 있는 입도분포, 단위중량 등의 기본 조건에 맞는 강화노반(보조도상, 입도조정층), 접속부 자갈재료, 상부노반재료에 대해 대형반복삼축압축시험을 수행하여 저변형률 수준에 따른 정규화전단탄성계수와 감쇠비곡선을 제안하고, 각 재료별로 수식 모델과 계수를 제시하였다.

Keywords

References

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