Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Effect of Engineering Properties on Resilient Modulus of Cohesive Soil as Subgrade

세립토의 회복탄성계수(Mr)에 대한 지반물성치의 영향

  • Kim, Dong-Gyou (Geotechnical Eng. Research Division, Korea Institute of Construction Technology) ;
  • Lee, Ju-Hyung (Geotechnical Eng. Research Division, Korea Institute of Construction Technology) ;
  • Hwang, Young-Cheol (Dept. of Construition System Eng., Sangji Univ.) ;
  • Chang, Buhm-Soo (Institute of Infrastructure Safety, Korea Infrastructure Safety and Technology Corporation)
  • 김동규 (한국건설기술연구원 Geo-인프라연구실) ;
  • 이주형 (한국건설기술연구원 Geo-인프라연구실) ;
  • 황영철 (상지대학교 건설시스템공학과) ;
  • 장범수 (한국시설안전공단 시설안전연구소)
  • Received : 2013.10.18
  • Accepted : 2013.10.21
  • Published : 2013.10.31
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Abstract

The objective of this study was to identify the effect of engineering properties on the resilient modulus ($M_r$) of cohesive soils as subgrade. Eight representative cohesive soils representing A-6, and A-7-6 soil types collected from road construction sites, were tested in the laboratory to determine their basic engineering properties. The laboratory tests for the engineering properties were Atterberg limits test, sieve analysis, hydrometer test, Standard Proctor compaction test, and unconfined compressive strength test. Resilient modulus test and unconfined compressive strength test were conducted on unsaturated cohesive soils at three different moisture contents (dry of optimum moisture content, optimum moisture content, and wet of optimum moisture content). The increase in moisture content considerably affected the decrease in the resilient modulus. The resilient modulus increased with an increase in maximum unconfined compressive strength, percent of clay, percent of silt and clay, liquid limit and plasticity index. The resilient modulus decreased with an increase in percent of sand.

본 연구의 목적은 노상토로 사용되는 세립토의 회복탄성계수($M_r$)에 대한 지반물성치의 영향을 평가하는 것이다. A-6그룹과 A-7-6그룹에 해당하는 8개의 세립토를 도로건설현장의 노상토에서 수집하여 지반물성치를 결정하였다. Atterberg 한계실험, 체분석, 비중계 분석, 다짐실험, 일축압축강도 실험은 세립토의 지반물성치를 결정하기 위해 수행되었다. 각 흙 시료에서 3가지 조건의 함수비(최적함수비보다 낮은 함수비, 최적함수비, 최적함수보다 높은 함수비)를 가진 시편에 대하여 $M_r$실험과 일축압축강도실험을 수행하였다. 세립토의 $M_r$은 함수비에 가장 큰 영향을 받았으며 함수비가 증가할수록 $M_r$은 감소하는 경향을 보였다. 세립토의 $M_r$은 일축압축강도, 점토 함유량, 실트와 점토 함유량, 액성한계, 소성지수가 증가할수록 증가하는 경향을 보였다. 또한, 모래의 함유량이 증가할수록 세립토의 $M_r$은 감소하는 경향을 보였다.

Keywords

References

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