VOLUME CHANGE AND SHEAR BEHAVIOR OF COMPACTED CLAYSAND/GRAVEL MIXTURES
Compacted clayey soils are used as hydraulic barriers in earth structures, such as core of earth fill dams, landfill liners, and etc. These soils have some defects from technical points of view. Mixing of these soils with granular materials (e.g. sand and gravel) is one of the soil improvement methods. A number of shrinkage, direct shear and triaxial tests are carried out on the mixtures of clay and sand/gravel. The results reveal that the values of shrinkage and swellingin the mixed clayey soils (in comparison with pure clay) decrease due to adding aggregates. Moreover, the inclusion of sand/gravel to the clays beyond a threshold value improves their shear strength and the values of shear strength and shrinkage depend on the size of grains added to the clay. Results of triaxial tests also indicate that the behavior of mixed specimens are changed from contractive to dilative with increasing of aggregates in the mixtures
Keywords:
Mixed clayey soils, shrinkage shear strength, laboratory tests,
___
- [1] Soltani-Jigheh, H. and Soroush, A., Behavior of mixed clayey soils under monotonic loading, International Journal of Science and Technology Amirkabir, 18, 21-29, 2007. [2] Soroush, A. and Soltani-Jigheh, H., Pre- and Post-cyclic Behavior of Mixed Clayey Soils, Canadian Geotechnical Journal, 46, No. 2, 115-1128, 2009. [3] Daniel, D.E. and Wu, Y.K., Compacted clay liners and covers for arid sites, Journal of Geotechnical Engineering, 119 (2), 223–237, 1993. [4] Albrecht, B.A. and Benson, C.H., Effect of desiccation on compacted natural clays, Journal of Geotechnical and Geoenvironmental Engineering, 127 (1), 67–75, 2001. [5] Kleppe, J.H. and Olson, R.E., Desiccation cracking of soil barriers, Hydraulic Barriers in
- Soil and Rock, 874, 263-275, 1985. [6] Indrawan, I.G.B., Rahardjo, H. and Leong, E.C., Effects of coarse-grained materials onproperties of residual soil, Engineering Geology, 82, 154-164, 2006.
- [7] Krisdani, H., Rahardjo, H. and Leong, E.C., Effects of different drying rates on shrinkagecharacteristics of a residual soil and soil mixtures, Engineering Geology, 102, 31-37,2008.
- [8] Holtz, W.G. and Willard, M., Triaxial shear characteristics of clayey gravel soils, SoilMechanics and Foundation Engineering, 82, 143-149, 1956.
- [9] Nakase, A., Nakanodo, H. and Kusakabe, O., Influence of soil type on pore pressureresponse to cyclic loading, In Proceeding of 5th Japan Earthquake EngineeringSymposium, 593-600, 1978.
- Başlangıç: 2009
- Yayıncı: Akdeniz Üniversitesi