Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Study on Young's Modulus of Coarse Granular Materials with Grain Size Distribution Adjustment

입도조정된 조립재료의 탄성계수에 대한 연구

  • Lee, Sung-Jin (Korea Railroad Research Institute, High-speed Railroad Systems Research Center) ;
  • Lee, Il-Wha (Korea Railroad Research Institute, High-speed Railroad Systems Research Center) ;
  • Lee, Su-Hyung (Korea Railroad Research Institute) ;
  • Lee, Jin-Wook (Korea Railroad Research Institute, High-speed Railroad Systems Research Center)
  • 이성진 (한국철도기술연구원 고속철도연구본부) ;
  • 이일화 (한국철도기술연구원 고속철도연구본부) ;
  • 이수형 (한국철도기술연구원 광역도시교통연구본부) ;
  • 이진욱 (한국철도기술연구원 고속철도연구본부)
  • Received : 2013.04.12
  • Accepted : 2013.07.05
  • Published : 2013.07.31
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Abstract

In the element test for coarse granular materials, the grain size distributions of the materials are often adjusted, in case the grain size of coarse material in the field is larger than the available maximum grain size of the laboratory test equipment. In this study, we carried out the large cyclic triaxial test to evaluate the effect of the grain size distribution adjustment on Young's modulus in small to intermediate strain level. The test results showed that the coarse granular materials with the adjusted grain size distribution underestimated Young's modulus of the original materials. The difference of Young's modulus was larger in small strain level than in intermediate strain level.

조립재료의 요소시험에서 장비에 허용되는 조립재료의 입자크기가 실제 현장에서 사용되는 입자크기에 비해 작은 경우가 종종 발생하기 때문에, 이러한 경우에는 시험에 사용되는 재료의 최대입경을 시험장치의 가용 크기까지 축소시켜 시험을 수행하게 된다. 본 연구에서는 이처럼 최대입경 크기를 축소시켜 입도를 조정했을 때, 저변형률에서의 탄성계수에 미치는 영향을 평가하기 위해 대형반복삼축압축시험을 수행하였다. 본 연구 대상재료의 시험 결과, 입도 조정된 시편들은 원입도 시편의 탄성계수를 과소평가하는 경향이 있었으며, 그 차이는 저변형률에서 더 크게 발생되었다.

Keywords

References

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