The Improvement of Triaxial Apparatus for Thermo-Hydro-Mechanical Behavior of Soils at Elevated Temperatures

Document Type : Research Article

Authors

1 Assistant Professor, Hamadan Branch, Islamic Azad University, Hamedan, Iran

2 Associate professor, Department of Civil Engineering Iran University of Science and Technology, Tehran, Iran

Abstract

The need for thermo-hydro-mechanical studies of soils at high temperatures has increased in environmental geomechanics these years. An important case is the behavior of engineering clay barrier or natural host rock in deep nuclear waste repositories that undergo high temperatures up to 120◦C. Only an apparatus designed for high temperatures can do this kind of studies. This research reviews design, assemble and calibration of a triaxial set that has been made for the first time in Iran. Triaxial tests at high temperatures indicated that sand-bentonite with unit weight in the range of density for engineering barrier of nuclear waste repositories, has contractive behavior. When this mixture was heat up to 110◦C, both peak and critical state shearing strength reduced about 20 percent and critical state friction angle decreased too. These results were similar to other authors’ results that show the apparatus has worked conveniently

Keywords

References

[1] Campanella R.G.; Mitchell J.K.; “Influence of Temperature Variations in Soil Behavior”, Journal of the Soil Mechanics and Foundations Division, Proceedings of American Society of Civil Engineers, vol. 94, no.SM3, pp. 709- 734, 1968
[2] De-Bruyn D.; Thimus J. F.; “The Influence of Temperature on Mechanical Characteristics of Boom Clay: The results of an Initial Laboratory Programme”, Engineering Geology, vol. 41, pp. 117- 126, 1996
[3] Cekerevac C.; Laloui L.; “Experimental Study of Thermal Effects on the Mechanical Behaviour of a Clay”, International Journal for Numerical and Analytical Methods in Geomechanics, vol. 28, pp. 209- 228, 2004.
[4] Kuntiwattanakul P.; Towhata I.; Ohishi K.; Seko I.; “Temperature Effects on Undrained Shear Characteristics of Clay”, Soils and Foundations, vol. 35, no.1, pp. 147- 162, 1995
[5] Moritz L.; “Geotechnical Properties of Clay at Elevated Temperature”, Swedish Geotechnical Institute, no. 47, Linkoping, 1995
[6] Demars K.R.; Charles R.D.; “Soil Volume Changes Induced by Temperature Cycling", Canadian Geotechnical Journal, vol. 19, pp. 188-194, 1982
[7] Baldi G.; Hueckel T.; Pellegrini R.; “Thermal Volume Changes of the Mineral-Water System in Low-Porosity Clay Soils”, Canadian Geotechnical Journal, vol. 25, pp. 807- 825, 1988.
[8] Lingnau B.E.; Graham J.; Tanaka N.; “Isothermal Modelling of Sand-Bentonite Mixtures at Elevated Temperatures”, Canadian Geotechnical Journal, vol. 32, pp. 78- 88, 1995.
[9] Delage P.; Sultan N.; Jun Cui Y.; “On Thermal Consolidation of Boom Clay”, Canadian Geotechnical Journal, vol. 37, p.p. 343-354, 2000.
[10] Villar M.V.; Sanchez M.; Gens A.; “Behaviour of a Bentonite Barrier in the Laboratory: Experimental Results up to 8 Years and Numerical Simulation”, Journal of Physics and Chemistry of the Earth, vol. 33, pp. 5476- 5485, 2008.
[11] Komine H.; “Simplified Evaluation on Hydraulic Conductivities of Sand-Bentonite Mixture Backfill”, Applied Clay Science, vol. 26, pp. 13-19, 2004.
[12] Mata C.; Guimaraes L.; Ledesma A.; Gens A.; Olivella S.; “A Hydro-geochemical Analysis of Saturation Process with Salt Water of a Bentonite Crushed Granite Rock Mixture in an Engineered Nuclear Barrier", Engineering geology, vol. 81, pp. 227- 245, 2005.
[13] Hendershot W. H.; Duquette M.; “A Simple Baruim Chloride Method for Determining Cation Exchange Capacity and Exchangeable Cations”, American Journal of Soil Sciences Society, no. 50, pp. 605- 608, 1986.
[14] Dentel S. K.; Use of Organic-Clay Adsorbent Materials for Groundwater Treatment Applications, Final Report for Delaware State Water Research Institute, Department of Civil and Environmental Engineering, University of Delaware, Newark, DE, 168, 1996.
[15] Mitchell J. K.; Soga K.; “Fundamentals of Soil Behavior”, 3nd Ed., Wiley, New York, 558 p, 2005.
Amirkabir Journal of Civil Engineering
Volume 47, Issue 1 - Serial Number 1
October 2015
Pages 99-108

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