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http://dx.doi.org/10.12989/gae.2018.16.6.599

A simplified method to estimate the total cohesion of unsaturated soil using an UC test  

Lin, Horn-Da (Department of Civil and Construction Engineering, National Taiwan University of Science and Technology)
Wang, Chien-Chih (Department of Civil Engineering and Geomatics, Cheng Shiu University)
Wang, Xu-Hui (Department of Civil and Construction Engineering, National Taiwan University of Science and Technology)
Publication Information
Geomechanics and Engineering / v.16, no.6, 2018 , pp. 599-608 More about this Journal
Abstract
This study investigates the feasibility of adopting the results of the UC (unconfined compression) test to assess the total cohesion of the unsaturated soil. A series of laboratory tests were conducted on samples of unsaturated lateritic soils of northern Taiwan. Specifically, the unconfined compression test was combined with the pressure plate test to obtain the unconfined compression strength and its matric suction of the samples. Soil samples were first compacted at designated water content and then subjected to the wetting process for saturation and the subsequent drying process to its target suction using the apparatus developed by the authors. The correlations among the matric suction, the unconfined compression strength and the total cohesion were studied. As a result, a simplified method to estimate the total cohesion using the unconfined compressive strength is suggested. The calculated results compare reasonably with the unsaturated triaxial test results. Current results show good performance; however, further study is warranted.
Keywords
unsaturated soil; matric suction; total cohesion; unconfined compressive strength;
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1 Cho, G.C. (2016), "Geotechnical engineering for sustainable development", Proceedings of the 2016 World Congress on Advances in Civil, Environmental and Materials Research (ACEM16), Jeju, Korea, August.
2 Estabragh, A.R. and Javadi, A.A. (2012), "Effect of suction on volume change and shear behaviour of an overconsolidated unsaturated silty soil", Geomech. Eng., 4(1), 55-65.   DOI
3 Fredlund, D.G. and Morgenstern, N.R. (1977), "Stress state variables for unsaturated soils", J. Geo. Eng., 103(5), 447-466.
4 Fredlund, D.G., Morgenstern, N.R. and Wider, R.A. (1978), "The shear strength of unsaturated soils", Can. Geotech. J., 15(3), 313-321.   DOI
5 Fredlund, D.G. and Rahardjo, H. (1993), Soil Mechanics for Unsaturated Soils, John Wiley & Sons, New York, U.S.A.
6 Ho, D.G. and Fredlund, D.G. (1982), "A multistage triaxial test for unsaturated soils", Geotech. Test. J., 5(1), 18-28.   DOI
7 Jiang, Y.S. (2014), "Characteristics of total cohesion and shear strength of unsaturated compacted lateritic soils", M.Sc. Thesis, National Taiwan University of Science and Technology, Taipei, Taiwan.
8 Kim, Y., Park, H. and Jeong, S. (2017), "Settlement behavior of shallow foundations in unsaturated soils under rainfall", Sustainability, 9(8), 1-13.
9 Lin, H.D., Kung, J.H.S., Wang, C.C., Liao, C.Y. and Tsai. M.F. (2010), "Stability analysis of unsaturated soil slope subjected to rainfall infiltration", Proceedings of the 4th Japan-Taiwan Joint Workshop on Geotechnical Hazards from Large Earthquakes and Heavy Rainfalls, Sendai, Japan, October.
10 Lee, S.J., Lee, S.R. and Kim, Y.S. (2003), "An approach to estimate unsaturated shear strength using neural network and hyperbolic formulation", Comput. Geotech., 30(6), 489-503.   DOI
11 Lin, H.D., Wang, C.C. and Kung, J.H.S. (2015), "Wetting and drying on matric suction of compacted cohesive soil", Proceedings of the ISOPE-2015, the 25th International Ocean and Polar Engineering Conference, Kona, Big Island, Hawaii, U.S.A., June.
12 Lin, H.D., Jiang, Y.S., Wang, C.C. and Chen, H.Y. (2016), "Assessment of apparent cohesion of unsaturated lateritic soil using an unconfined compression test", Proceedings of the 2016 World Congress on Advances in Civil, Environmental and Materials Research (ACEM16), Jeju, Korea, August.
13 Lin, H.D., Wang, C.C. and Jhou, B.H. (2017), "A study of the apparent cohesion and shear strength characteristics of unsaturated compacted lateritic soil", J. Technol., 32(3), 117-185.
14 Ng, C.W.W., Sadeghi, H., Hossen, B., Chiu, C.F., Alonso, E.E. and Baghbanrezvan, S. (2016), "Water retention and volumetric characteristics of intact and re-compacted loess", Can. Geotech. J., 53(8), 1258-1269.   DOI
15 Tang, Y., Taiebat, H.A. and Senetakis, K. (2017), "Effective stress based bearing capacity equations for shallow foundations on unsaturated soils", J. GeoEng., 12(2), 59-64.
16 Nyunt, T.T., Leong, E.C. and Rahardjo, H. (2011), "Stress-strain behavior and shear strength of unsaturated residual soil from triaxial tests", Proceedings of the 5th Asia-Pacific Conference on Unsaturated Soils: Theory and Practice, Pattaya, Thailand, November.
17 Oh, W.T and Vanapalli, S.K. (2011), "Modelling the applied vertical stress and settlement relationship of shallow foundations in saturated and unsaturated sands", Can. Geotech. J., 48(3), 425-438.   DOI
18 Rahardjo, H., Meilani, I. and Leong, E.C. (2009), "Shear strength characteristics of a compacted soil under infiltration conditions", Geomech. Eng., 1(1), 35-52.   DOI
19 Shou, K.J., Wu, C.C. and Lin, J.F. (2018), "Predictive analysis of landslide susceptibility under climate change conditions-a study on the Ai-Liao watershed in southern Taiwan", J. GeoEng., 13(1), 13-27.
20 Tekinsoy, M.A., Kayadelen, C., Keskin, M.S. and Soylemez, M. (2004), "An equation for predicting shear strength envelope with respect to matric suction", Comput. Geotech., 31(7), 589-593.   DOI
21 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. J., 33(3), 379-392.   DOI
22 Vilar, O.M. (2006), "A simplified procedure to estimate the shear strength envelope of unsaturated soils", Can. Geotech. J., 43(10), 1088-1095.   DOI
23 Zhang, L.L., Fredlund, D.G., Fredlund, M.D. and Wilson, G.W. (2014), "Modeling the unsaturated soil zone in slope stability analysis", Can. Geotech. J., 51(12), 1384-1398.   DOI
24 Wang, C.C., Kung, J.H. S., Liao, C.Y. and Lin, H.D. (2010), "Experimental study on matric suction of unsaturated soil upon drying and wetting", Proceedings of the 3rd International Conference on Problematic Soils, Adelaide, Australia, April.
25 Yang, H., Rahardjo, H., Leong, E.C. and Fredlund, D.G. (2004a), "Factors affecting drying and wetting soil-water characteristic curves of sandy soils", Can. Geotech. J., 41(5), 908-920.   DOI
26 Yang, S.R., Lin, H.D., Kung, H.S.J. and Liao, J.Y. (2008), "Shear wave velocity and suction of unsaturated soil using bender element and filter paper method", J. GeoEng., 3(2), 67-74.
27 Yang, S.R., Lin, H.D., Kung, H.S.J. and Huang, W.C. (2008), "Suction-controlled laboratory test on resilient modulus of unsaturated compacted subgrade soils", J. Geotech. Geoenviron. Eng., 134(9), 1375-1384.   DOI
28 Yang, S.R., Lin, H.D. and Huang, W.H. (2012), "Variation of initial soil suction with compaction conditions for clayey soils", J. Mech., 28(3), 431-437.   DOI
29 Lewis, C.D. (1982), Industrial and Business Forecasting Method, Butterworth Scientific Publishers, London, U.K.