Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Characteristics of Friction Angles between the Nak-dong River Sand and Construction Materials by Direct Shear Test

낙동강 모래와 건설재료간의 직접전단시험에 의한 마찰각 특성

  • 김영수 (경북대학교 토목공학과) ;
  • 김대만 (경북대학교 토목공학과)
  • Published : 2009.04.30
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Abstract

In this study, a series of direct shear tests were performed to investigate the characteristics of friction angles for sands and interface friction angle between sands and construction materials with respect to different relative density of the Nak-dong River sands and shearing velocity. The result of the test shows that friction angles of sands are always higher than interface friction angle between sands and construction materials. As the shearing velocity get faster, the friction angles of sand became higher. With respect to the density of sand by reducing void ratio, friction angles increase linearly, and relevant equations were proposed to calculate the friction angle by changing void ratio and relative density of sand. The interface roughness of construction materials was also an important factor in interface friction angle.

본 연구에서는 낙동강 모래의 내부마찰각과 모래와 건설재료들과의 접촉면에서 발생되는 표면마찰각의 특성을 파악하기 위하여 모래의 상대밀도와 전단속도를 변화시켜 목재, 강재, 몰탈, 그리고 역청재와 일련의 직접전단시험을 실시하였다. 시험결과 모든 경우에서 모래의 내부마찰각이 건설재료와의 표면마찰각보다 항상 크게 나타났고, 전단속도가 빠를수록 마찰각이 조금 증가되었다. 모래의 간극비가 작아짐에 의한 조밀화에 따라 마찰각은 선형적으로 증가하였으며, 간극비와 상대밀도의 변화에 따라 마찰각을 산정할 수 있는 식을 제시하였다. 또한 건설재료의 표면거칠기는 표면마찰각에 있어 중요한 인자임을 알 수 있었다.

Keywords

References

  1. Acar, Y. B., Durgunoglu, H. T., and Tumay, M. T. (1982), "Interface Properties of Sands", Journal of the Geotechnical Engineering Division, ASCE, Vol.108, No.4, pp.648-654
  2. Al-Mhaidib, A. I. (2005), "Shearing Rate Effect on Interfacial Friction Between Sand and Steel", Proceeding of the 15th International Offshore and Polar Engineering Conference (ISOPE-2005), Seoul, Korea, Vol.2, pp.633-640
  3. Al-Mhaidib, A. I. (2005), "Shearing Rate Effect on Interfacial Friction Between Sand and Steel", Proceeding of the 15th International Offshore and Polar Engineering Conference (ISOPE-2005), Seoul, Korea, Vol.2, pp.633-640
  4. Coyle, H. M., and Sulaiman, I. H. (1967), "Skin Friction for Steel Piles in Sand", Journal of Soil mechanics and Foundations Division, ASCE, Vol.93, SM6, pp.261-278
  5. Oda, M. (1972), "Initial Fabrics and Their Relations to the Mechanical Properties of Granular Material", Soils and Foundations, Vol.12, No.1, pp.17-36 https://doi.org/10.3208/sandf1960.12.17
  6. Potyondy, J. G. (1961), "Skin Friction Between Various Soils and Construction Materials", Geotechnique, Vol.11, No.4, pp.339-353 https://doi.org/10.1680/geot.1961.11.4.339
  7. Uesugi, M., and Kishida, H. (1986), "Influential Factors of Friction Between Steel and Dry Sands", Soils and Foundations, Vol.26, No.2, pp.33-46 https://doi.org/10.3208/sandf1972.26.2_33
  8. Yamamuro, J. A., Covert, K. M., and Lade, P. V. (1999), "Static and Cyclic Liquefaction of Silty Sands", Proceedings of the International workshop on physics and mechanics of soil liquefaction, Baltimore, Maryland, USA, pp.55-65
  9. 김상규, 이은수 (1996), "화강토와 보강재 경계면에서의 마찰계수에 관한 연구", 한국지반공학회논문집, 한국지반공학회, 제12권, 제2호, pp.107-114
  10. 신강호 (1990), "직접전단 실험에 의한 조립토와 건설재의 전단및 마찰거동연구", 석사학위논문, 한국과학기술원