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The Relationship Between Effective Stress and Shear Strength of Weathered Granite Soils Based on Matric Suctions  

Lee, Younghuy (영남대학교 건설시스템공학과)
Oh, Seboong (영남대학교 건설시스템공학과)
Kim, Kwanghyun ((주)에스코컨설턴트)
Seong, Yulho (대림산업(주) 기술개발원 토목연구지원팀)
Publication Information
Journal of the Korean GEO-environmental Society / v.13, no.4, 2012 , pp. 45-51 More about this Journal
Abstract
The shear strength of weathered granite soils under unsaturated condition was evaluated by $K_0$ consolidated triaxial tests. Various matric suctions in the unsaturated triaxial tests were applied using suction-controlled triaxial test apparatus for weathered granite soils obtained in Daegu. Soil water characteristic curve (SWCC) laboratory tests for drying and wetting procedure were performed and van Genuchten curves were fitted by experimental results. The contribution of matric suction in unsaturated soils is directly correlated to effective stress and evaluated from SWCCs. The effective stresses were estimated from these SWCCs and the relationship between effective stress and unsaturated shear strength was determined. In the effective stress description, the unsaturated shear strength with respect to various suctions indicates unique relationship and almost the same as that of the saturated envelope.
Keywords
Unsaturated soils; Shear strength; Weathered granite soil; $K_0$ condition; Triaxial tests; Matric suction;
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  • Reference
1 Bishop, A. W. (1954), The Use of Pore Water Coefficients in Practice, Geotechnique, Vol. 4, No. 4, pp. 148-152.   DOI
2 Bishop, A. W. (1959), The Principle of Effective Stress, Teknisk Ukeblad I Samarbeide MedTeknikk, Oslo, Norway, Vol. 106, No. 39, pp. 859-863.
3 Bishop, A. W., and Blight, G. E. (1963), Some Aspects of Effective Stress in Saturated and Partly Saturated Soils, Geotechnique, Vol. 13, No. 3, pp. 177-197.   DOI
4 Fredlund, D. G., Mogenstern, N. R.(1977), Stress State Variablea for Unsatured Soils, Journal of Geotechnicaland Geoenvironmental Engineering, Vol. 103, No. 5, pp. 447-466.
5 Kim, T. H. (2009), The Influence of Overburden Pressure and Volume Change on the Soil-water Characteristic Curve of Unsaturated Weathered Granite Soil, MSc Thesis, Yeungnam Univ. pp. 68-75.(in Korean)
6 Kim, T.-K. (2011), On the Effective Stress of Unsaturated Soils During K0 Consolidated Triaxial Tests, Ph.D. Thesis, Yeungnam Univ. pp. 89-95.(in Korean)
7 Kim, T. K. and Oh, S (2008), On the Bishop Stress of Unsaturated Soils under the Low Level of Matric Suction, Journal of Korean Geotechnical Society, Vol. 24, No. 7, pp. 17-24.(in Korean)
8 Lee, S. J., Lee, S. R. and Jang, B. S. (2002), Unsaturated Shear Strength Characteristics of Weathered Granite Soils, Journal of Korea Society of Civil Engineers, Vol. 22, No. 1C, pp. 81-88.(in Korean)
9 Lu, N., and Likos, W. J. (2006), Suction Stress Characteristic Curve for Unsaturated Soils, Journal of Geotechnicaland Geoenvironmental Engineering, Vol. 132, No. 2, pp. 131-142.   DOI   ScienceOn
10 Lu, N., and Godt, J., and Wu, D. T. (2010), A Closed-form Equation for Effective Stress in Unsaturated Soil, Water Resources Research, Vol. 46, W05515. pp. 1-14.
11 Oh, S, Mun, J.-H., Kim, T.-K., Kim, Y. K. (2008), A Case Study of Rainfall-Induced Slope Failures on the Effect of Unsaturated Soil Characteristics, Journal of Korea Society of Civil Engineers, Vol. 28, No. 3C, pp. 167-178.(in Korean)
12 Vanapalli, S.K., Fredlund, D.G., Pufahl, D,E. and Clifton, A,W.(1996), Model for the Prediction of Shear Strength with Respect to Soil Suction, Canadian Geotechnical Journal, Vol. 33, No. 3, pp. 379-392.   DOI   ScienceOn
13 van Genuchten, M. T. (1980), A Closed-form Equation for Predicting the Hydraulic Conductivity of Unsaturated Soils, Soil Science Society of America Journal, Vol. 44, No. 5, pp. 892-898.   DOI   ScienceOn
14 van Genuchten, M. T., Leij, F. J., and Yates, S. R. (1991), The RETC Code for Quantifying the Hydraulic Functions of Unsaturated Soils, EPA600/2-91/065. pp. 4-12.