Browse > Article
http://dx.doi.org/10.12814/jkgss.2016.15.4.063

Comparison of Shear Strength Characteristics of Unsaturated Soil From Triaxial Compression Tests with Direct Shear Tests  

Hwang, Hui-Seok (Dept. of Civil Engineering, Kangwon National University)
Choi, Young-Nam (Dept. of Civil Engineering, Kangwon National University)
Park, Byung-Soo (Dept. of Civil Engineering, Gangwon State University)
Yoo, Nam-Jae (Dept. of Civil Engineering, Kangwon National University)
Publication Information
Journal of the Korean Geosynthetics Society / v.15, no.4, 2016 , pp. 63-69 More about this Journal
Abstract
In this paper, shear strength characteristics of an unsaturated soil were compared using triaxial compression tests(CD) and modified direct shear tests and thus feasibility of the newly modified direct shear testing apparatus was confirmed. The shear strength tests of unsaturated state with a soil sample, obtained from a slope where debris flow occurred at Yangpyeong in Kyeunggi province during 2010, were performed. Both tests showed a linear relationship of matric suction with the shear strength under low level of matric suction. The apparent cohesion of the unsaturated soil was also increased linearly with increase of matric suction. As results of comparing two different testing apparatus, estimated values of shear strength parameters of unsaturated soil($c^{\prime}$, ${\phi}^b$) were slightly larger in the modified direct shear tests due to constraint effect of shear box.
Keywords
Shear strength characteristics of unsaturated soil; Triaxial compression tests; Modified direct shear tests; Shear strength parameters of unsaturated soil;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 Escrio. V. and Saez, J. (1986), The Shear Strength of Partly Saturated Soils. Geotechnique, Vol.36, No.3, pp.453-456.   DOI
2 Fredlund, D. G., Morgenstern, N. R. and Widger, R. A. (1978), The Shear Strength of Unsaturated Soils, Can. Geothch. Journal, Vol.15, No.3, pp.313-321.   DOI
3 Fredlund, D. G. and Rahardjo, H. (1993), Soil Mechanics for Unsaturated Soils, John Wiley and Sons, Inc., pp.228-235.
4 Gan, J. K. M., Fredlund, D. G. and Rahardjo, H. (1988), Determination of The Shear Strength Parameters of On Unsaturated Soil using The Direct Shear Test, Can. Geotech. Journal, Vol.25, No.3, pp.500-510.   DOI
5 Kim, C. K. (2003), Characteristics of Stress-Strain Behaviour for Unsaturated Weathered Granite Soil, KSCE, Vol.23, No.3C, pp.177-184 (in Korean).
6 Kim, S. N., Park, C. W., Mok, Y. J. and Kim, S. M. (2005), Determination of Soil Water Characteristic Curve and Permeability Equation of Unsaturated Soils using Modified Triaxial Apparatus, Korean Geotechnical Society, Vol.21, No.5, pp.59-64 (in Korean).
7 Kwak, C. S., Yoo, K, S., Park, B. S. and Yoo, N. J. (2011), Development of Unsaturated Direct Shear Testing Apparatus, Proceeding of Korean Geotechnical Society(KGS) Fall National Conference, KGS, pp.266-274 (in Korean).
8 Lee, S. J., Lee, S. R. and Jang, B. S. (2002), Unsaturated Shear Strength Characteristics of Weathered Granite Soils, KSCE, Vol.22, No.1-C, pp.81-88 (in Korean).
9 Lim, S. Y. (2007), The Shear Characteristics of Unsaturaed Sandy Soils, Korean Geotechnical Society, Vol.23, No.10, pp.57-64 (in Korean).
10 Oh, S. B., Lee, J. P., Kim, T. K. and Kwon, O. K. (2009), An Analysis of Stress-Strain Relationships of Unsaturated Soils Based on Bishop Stress, KSCE, Vol.29, No.4C, pp.175-182 (in Korean).
11 Rassam, D. W. and Williams, D. J. (1999), A Relationship Describing the Shear Strength of Unsaturated Soils, Can. Geotech. Journal, Vol.36, No.2, pp.363-368.   DOI
12 Taha, M. R., Hossain, M. K. and Mofiz, S. A. (2000), Shear Strength Behaviour of Unsaturated Granite Residual Soil, Unsaturated soils for Asia. Proceedings of the Asian Conference on Unsaturated Soils, UNSAT-ASIA 2000, Singapore, pp.575-580.
13 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, Can. Geotech. Journal, Vol.33, No.3, pp.379-392.   DOI