Journal of the Korean Geosynthetics Society (한국지반신소재학회논문집)

Korean Geosynthetics Society (한국지반신소재학회)
권호 표지
DOI QR코드

DOI QR Code

Development and Uncertainty Assessment of Interface Friction Prediction Equation Between Steel Surface and Cohesionless Soils

강재면과 사질토 사이의 경계면 마찰각 예측식 개발 및 불확실성 평가

  • Lee, Kicheol (Dept of Civil and Environmental Engineering, Incheon National University) ;
  • Kim, So-Yeun (College of Business Management, Hongik University) ;
  • Kim, Dongwook (Department of Civil and Environmental Engineering, Incheon National University)
  • Received : 2018.06.11
  • Accepted : 2018.06.19
  • Published : 2018.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

Characteristics of interface friction between cohesionless soils and geotechnical structure surfaces play an important role in the analysis of earth load and resistance on the structure. In general, geotechnical structures are mainly composed of either steel or concrete, and their surface roughnesses with respect to soil particle sizes influence the interface characteristics between soils and the structures. Accurate assessment of the interface friction characteristics between soils and structures is important to ensure the safety of geotechnical structures, such as mechanically stabilized earth walls reinforced with inextensible reinforcements, piles embedded into soils, retaining wall backfilled with soils. In this study, based on the database of high quality interface friction tests between frictional soils and solid surfaces from literature, equation representing peak interface friction angle is proposed. The influential factors of the peak interface friction angle are relative roughness between soil and solid surface, relative density of frictional soil, and residual (constant volume) interface friction angle. Futhermore, for the developed equation of the interface friction angle, its uncertainty was assessed statistically based on Goodness-of-fit test results.

지반구조물에서는 흙과 구조물 사이의 상호 마찰 특성이 구조물에 작용하는 하중과 저항 분석에 큰 영향을 미친다. 일반적으로 지반구조물의 주재료로서 콘크리트 또는 강재가 많이 사용되며, 흙 입자 크기와 비교하여 마찰면의 거칠기 정도에 따라 경계면 마찰 특성이 큰 차이를 보인다. 특히 비신장성 보강재를 사용하는 보강토 옹벽, 말뚝 주면, 옹벽면 등의 지반구조물에 대해서는 흙과 구조물 사이의 마찰특성을 합리적으로 분석하여 구조물의 안전성을 확보하여야 한다. 구조물면과 사질토 사이의 마찰특성에 대하여 보다 정확한 예측식을 제시하고 이 예측식이 가지고 있는 불확실성을 제시하는 것은 지반-지반구조물의 신뢰성 분석에 필수적이다. 따라서 본 연구에서는 기존 양질의 연구 문헌들에 보고된 흙과 거칠기가 다른 면 사이의 마찰실험결과를 분석하여, 강재와 사질토 사이의 첨두 경계면 마찰각을 구하는 식을 제안하였다. 첨두 경계면 마찰각을 결정하는 주요인자는 경계면의 상대조도, 흙의 상대밀도, 구속압, 한계상태 경계면 마찰각이다. 본 연구에서 개발한 첨두 경계면 마찰각 예측식에 대한 불확실성을 통계적으로 Goodness-of-fit 시험 결과를 반영하여 평가하였다.

Keywords

References

  1. Alberto, M. O., and Carlos, G. F. (2010), "Goodness-of-fit Testing", International Encyclopedia of Education, Vol.7, pp.190-196.
  2. Bolton, M. D. (1986), "The Strength and Dilatancy of Sands" Geotechnique, Vol.36, No.1, pp.65-78. https://doi.org/10.1680/geot.1986.36.1.65
  3. Lee, S., Lee, Y. W., and Yi, C. T. (1999), "Study on the interaction of soil-nail by in-situ pull-out test", Journal of Korean Society of Civil Engineering, Vol.19, No.3-5, pp.975-983. (in Korean)
  4. Lings, M. L. and Dietz, M. S. (2005), "The Peak Strength of Sand-Steel Interfaces and the Role of Dilation", Soils and Foundations, Vol.45, No.6, pp.1-14. https://doi.org/10.3208/sandf.45.1
  5. Mathwave (2004), Goodness of Fit Tests, http://www.mathwave.com/articles/goodness_of_fit.html.
  6. O'Rourke, T. D., Druschel, S. J., and Netravali, A. N. (1990), "Shear strength characteristics of sandpolymer interfaces", Journal of Geotechnical Engineering, Vol.116, No.3, pp.451-469. https://doi.org/10.1061/(ASCE)0733-9410(1990)116:3(451)
  7. Paikowsky, S. G., Player, C. M., and Connors, P. J., (1995), "A Dual Interface Apparatus for Testing Unrestricted Friction of Soil along Solid Surfaces," Geotechnical Testing Journal, Vol.18, No.2, pp.168-193. https://doi.org/10.1520/GTJ10320J
  8. Porcino, D., Fioravante, V., Ghionna, V. N., and Pedroni, S. (2003), "Interface Behavior of Sands from Constant Normal Stiffness Direct Shear Tests", Geotechnical Testing Journal, Vol.26, No.3, pp.1-13.
  9. 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
  10. Reddy, E. S., Chapman, D. N., and Sastry, V. V. R. N. (2000), "Direct Shear Interface Test for Shaft Capacity of Piles in Sand", Geotechnical Testing Journal, Vol.23, No.2, pp.199-205. https://doi.org/10.1520/GTJ11044J
  11. Subba, R. K. S., Allam, M. M., and Robinson, R. G. (1998), "Interfacial Friction between Sands and Solid Surfaces", Proceeding of the Institution of Civil Engineers, Vol.131, pp.75-82.
  12. Uesugi, M. and Kishida, H. (1986), "Influential Factors of Friction between Steel and Dry Sand", Soils and Foundations, Vol.26, No.2, pp.33-46. https://doi.org/10.3208/sandf1972.26.2_33
  13. Uesugi, M., Kishida, H., and Uchikawa, Y. (1990), "Friction between Dry Sand and Concrete under Monotonic and Repeated Loading", Soils and Foundations, Vol.30, No.1, pp.115-128. https://doi.org/10.3208/sandf1972.30.115