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Effect of Bentonite fine Content on the Triaxial Shear Behavior of Sandy Soils | ||
| AUT Journal of Civil Engineering | ||
| مقاله 6، دوره 2، شماره 2، اسفند 2018، صفحه 177-182 اصل مقاله (441.51 K) | ||
| نوع مقاله: Research Article | ||
| شناسه دیجیتال (DOI): 10.22060/ajce.2018.14451.5476 | ||
| نویسندگان | ||
| M. Hasanlourad* 1؛ S.M.H. Khatami1؛ M. M. Ahmadi2 | ||
| 1Faculty of Engineering, Imam Khomeini International University, Qazvin, Iran | ||
| 2Civil Engineering Department, Sharif University of Technology, Tehran, Iran | ||
| چکیده | ||
| Addition of fine and plastic clays such as bentonite to sandy soils is one of the methods of reducing soil hydraulic conductivity and making it suitable for seepage barriers. Also, in nature, soil mixtures such as clayey sands, silty sand and clayey silts are found much more than pure soils such as clean sand, clay or silt. Thus, in this paper, the effects of adding bentonite particles on the shear behavior of a sandy soil were studied by performing series of consolidated un-drained triaxial tests. In these experiments, different amounts of weight contents of bentonite such as 0, 5 and 10% were added to a sandy soil named Firoozkooh sand. Generally, obtained results showed that addition of bentonite led to changes in the shear behavior and strength of sand. These changes depend on the relative density of soil, confining stress and bentonite content. As an example, in loose samples of sand, addition of bentonite reduced the maximum deviator stress of the soil; on the other hand, in dense samples, addition of 5% bentonite reduced the deviator stress. However, addition of 10% bentonite increased the deviator stress. Generally, addition of bentonite reduced the secant modulus of elasticity and increased the positive pore water pressure at phase transition point. It is worth noting that, in dense samples, the effectiveness of bentonite content was not as high as that in loose samples and, in some conditions, the results did not follow a specific trend. | ||
| کلیدواژهها | ||
| Sand-bentonite Mixture؛ Triaxial Test؛ Shear Behavior | ||
| مراجع | ||
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[1] R.K. Rowe, Geosynthetics and minimisation of contaminant migration through barrier systems beneath solid waste, Proceedings of the Sixth International Conference on Geosynthetics, Atlanta, USA, (1988) 27-82. [2] R.N. Yong, Geoenvironmental engineering, contaminated soils, pollutant fate and mitigation, CRC Press, Boca Raton, 307 (2001). [3] E. Brain, P.E. Simpson, Five factors influencing clay/geomembrane interface, Canadian Geotechnical Journal, (2001) 11-18. [4] D. Moir, Haug, C. Lionel, Impact of modeling water content on hydraulic conductivity of compacted sand-bentonite, Canadian Geotechnical Journal, 29 (1992) 253-262. [5] Saindon, R., and Whitworth, T. M., Reverse osmosis properties of bentonite/glass bead mixtures at low compaction pressures, Applied Clay Sciences, 31(1-2) (2006) 90-95. [6] P.G. Studds, D.I. Stewart, T.W. Cousens, Y.Y. Tay, Designing bentonite enhanced soils to perform as environmental barriers, Clay Minerals, 33 (2002) 459-462. [7] C. Alston, D.E. Daniel, D.J. Devroy, Design and construction of sand-bentonite liner for effluent treatment lagoon, Marathon, Ontario, Canadian Geotechnical Journal, 34 (1997) 841-852. [8] E.E. Alonso, E. Romero, C. Hoffmann, E. Garcia Escudero, Expansive bentonite-sand mixtures in cyclic controlled-suction drying and wetting, Engineering Geology Journal, 81 (2005) 213-226. [9] N. Dixon, Engineering properties and use of geosynthetic clay liners, Thomas Telford, Proceedings Geotechnical Engineering of Landfills, (1998) 131-148. [10] EPA; Design and construction of RCRA-CERCLA final covers, Report No. 2, Cincinnati, Ohio, May 1991. [11] H. Ito, Compaction properties of granular bentonites, Applied Clay Sciences, 31(1-2) (2006) 47-55. [12] D.I. Stewart, P.G. Studds, T.W. Cousens, The factors controlling the engineering properties of bentoniteenhanced sand, Applied Clay Sciences, 23(1-4) (2003) 97-110. [13] EPA, Process design manual, land application of municipal sludge, Municipal Environmental Research Laboratory, EPA-625/1-83-016. (1983) 31-32. [14] Van Ree CCDF, F.A. Weststrate, C.G. Meskers C.N. Bremmer, Design aspects and permeability testing of natural clay and sand-bentonite liners, Geotechnique, 42(1) (1992) 49–56. [15] D.E. Daniel, Future trends in liners and covers, Proceeding of the GRI-13 Conference on Geosynthetic in the future, year 2000 and beyond, P.A.USA, 263-273, 1999. [16] R. Chapuis, P. Robert, Sand-bentonite liners: predicting permeability from laboratory tests, Canadian Geotechnical Journal, 27 (1989) 47-57. [17] C. Alston, D.E. Daniel, D.J. Devroy, Design and construction of sand-bentonite liner for effluent treatment lagoon. Marathon, Ontario, Canadian Geotechnical Journal, 34 (1997) 841-852. [18] Kumar S, Yong W.L., “Effect of bentonite on compacted clay landfill barriers” Soil and Sediment Contamination: An International Journal, 11(1) (2002) 71-89. [19] Ameta N.K., Wayal A.S., Effect of bentonite on permeability of dune sand, Electronic Journal of Geotechnical Engineering, 13 January (2008). [20] M.K. Gueddouda, M. Lamara, N. Aboubaker, S. Taibi, Hydraulic conductivity and shear strength of dune sand–bentonite mixtures, Electronical Journal of Geotechnical Engineering, 13(2008) 1–15. [21] Proia R., Croce P., Modoni G., Experimental Investigation of Compacted Sand-bentonite Mixtures, Procedia Engineering, 158 (2016) 51-56. [22] K. Badv, Aliashrafi H., Laboratory Investigation of Geotechnical and Geoenvironmental Characteristics of Bentonite-Enhanced Sand Mixtures as Landfill Liner Material, Journal of Civil and Environmental Engineering, 45(2) (2015), [23] ASTM D6913 / D6913M – 17, Standard Test Methods for Particle-Size Distribution (Gradation) of Soils Using Sieve Analysis. [24] ASTM D4253-16, Standard Test Methods for Maximum Index Density and Unit Weight of Soils Using a Vibratory. [25] ASTM D4254 – 00, Standard Test Methods for Minimum Index Density and Unit Weight of Soils and Calculation of Relative Density. [26] ASTM D4318 - 17e1, Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils. [27] ASTM D4767 – 11, Standard Test Method for Consolidated Undrained Triaxial Compression Test for Cohesive Soils. | ||
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