Browse > Article
http://dx.doi.org/10.7843/kgs.2022.38.2.5

Shear Strength-strain Behavior of Unsaturated Weathered Soil (SM)  

Jeong, Sang-Seom (Dept. of Civil and Environment Engrg., Yonsei Univ.)
Lee, Seong-Cheol (Dept. of Civil and Environment Engrg., Yonsei Univ.)
Jeong, Seung-Hwa (Korea Expressway Corporation)
Publication Information
Journal of the Korean Geotechnical Society / v.38, no.2, 2022 , pp. 5-13 More about this Journal
Abstract
The unsaturated behavior of sandy silt (SM soil) was investigated experimentally. Special attention was given to the stress-strain behavior of unsaturated weathered soil (SM) prior to failure and behavior at failure under monotonic loading. A sandy silt (SM) weathered soil containing a certain amount of fine contents distributed in Korea, was chosen to form samples with different densities of Dr=25%, 60%, and 75%. and matric suctions. The isotopically Consolidated Drain test (CD-test) was performed to maintain a constant matric suction during the shearing process. Based on the experimental results, it was qualitatively identified that the higher the relative density, the greater the virtual friction angle (ϕb) value and AEV (Air Entry Value) were induced. Also it is found that the internal friction angle (ϕ') is more or less constant. even if the matric suction is increased.
Keywords
Apparent cohesion; Consolidation Drain test (CD-test); Matric suction; Relative density; Unsaturated triaxial loading test; Unsaturated shear strength; Virtual friction angle; Weathered soil;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Lee, Y. H., Oh, S., Kim, K., and Seong, Y. (2012), The Relationship between Effective Stress and Shear Strength of Weathered Granite Soils based on Matric Suctions, Journal of the Korean Geo-Environmental Society, Vol.13, No.4, pp.45-51.
2 Marinho, F. A. M., Take, W. A., and Tarantino, A. (2008), Measurement of Matric Suction Using Tensiometric and Axis Translation Techniques. In Laboratory and field testing of unsaturated soils, pp.3-19.
3 Oh, S. B. and Kim, T. (2008), On the Bishop stress of Unsaturated Soils under the Low Level of Matric Suction, Journal of the Korean Geotechnical Society, Vol.24, No.7, pp.17-24.   DOI
4 Oh, S. B., Lee, J., Kim, T., and Kim, Y. (2009), An Analysis of Stress Relationships of Unsaturated Soils based on Bishop Stress, Journal of the Korean Society of Civil Engineers, C, Vol.29, No.4C, pp.175-182.
5 Rahardjo, H., Heng, O. B., and Choon, L. E. (2004), Shear Strength of a Compacted Residual Soil from Consolidated Drained and Constant Water Content Triaxial Tests, Canadian Geotechnical Journal, Vol. 41, No.3, pp.421-436.   DOI
6 Song, C. S. and Chang, P. (1994), Development of Constitutive Model for the Prediction of Behaviour of Unsaturated Soil (II) - Development and application of constitutive model-, Magazine of the Korean Society of Agricultural Engineers, Vol.36, No.4, pp. 87-94.
7 Song, Y. S. (2014), Suction Stress in Unsaturated Sand at Different Relative Densities, Engineering Geology, 176, pp.1-10.   DOI
8 Sung, S. G. and Lee, I. (2003), The Influence of Net Normal Stresses on the Shear Strength of Unsaturated Residual Granite Soils, Journal of the Korean Geotechnical Society, Vol.19, No.2, pp.27-38.
9 Van Genuchten, M. T. (1980), A Closed-form Equation for Predictingthe Hydraulic Conductivity of Unsaturated Soils, Soil science society of America journal, Vol.44, No.5, pp.892-898.   DOI
10 Bishop, A. W. (1959), The Principle of Effective Stress, Teknisk Ukeblad I Samarbeide Med Teknikk, Oslo, Norway, Vol.106, No. 39, pp.859-863.
11 Ng, C. W., Zhan, L. T., and Cui, Y. J. (2002), A New Simple System for Measuring Volume Changes in Unsaturated Soils, Canadian geotechnical journal, Vol.39, No.3, pp.757-764.   DOI
12 Fredlund, D. G. and Rahardjo, H. (1993), Soil Mechanics for Unsaturated Soils, John Wiley and Sons, pp.228-235.
13 Fredlund, D. G., Morgenstern, N. R., and Widger, R. A. (1978), The Shear Strength of Unsaturated Soils, Canadian Geothchnical Journal, Vol.15, No.3, pp.313-321.   DOI
14 Kim, Y. S. and Fusao Oka. (2008), Espeimental Study on the Triaxial Compressive behaviour of Unsaturated Compacted Silt under Various Suction Levels, Journal of the Korean Geotechnical Society, Vol.24, No.1, pp.25-35.   DOI
15 Hong, M. and Jeong, S. (2019), A Combined Method for Rainfall-induced Landslides and Debris Flows in Regional-scale Areas, Journal of the Korean Geotechnical Society, Vol.35, No.10, pp. 17-31.   DOI
16 Kim, J., Kim, Y., Jeong, S., and Hong, M. (2017), Rainfall-induced Landslides by Deficit Field Matric Suction in Unsaturated Soil Slopes, Environmental Earth Sciences, Vol.76, No.23, pp.1-17.   DOI
17 Jeong, S. S., Lee, K., Kim, J., and Kim, Y. (2017), Analysis of Rainfall-induced Landslide on Unsaturated Soil Slopes, Sustainability, Vol.9, No.7, pp.1280.   DOI
18 Kang, D. H., Hong, M., and Jeong, S. (2021), A Simplified Depth-averaged Debris Flow Model with Herschel-Bulkley Rheology for Tracking Density Evolution: a Finite Volume Formulation, Bulletin of Engineering Geology and the Environment, pp.1-16.
19 Kim, J. H. and Jeong, S. (2000), Stability Analysis of Unsaturated slopes during rainfall, Korean Society of Civil Engineers Convention, held in Pyeongchang, South Korea, 2, pp.611-614.