A Study of the Rockfill Material Behavior in Large-Scale Tests

Document Type : Research Papers


1 Associate professor of civil engineering, Kharazmi University

2 Associate professor Kharazmi University

3 Researcher Student, Kharazmi University


Inspecting the behavior of the rockfill materials is of significant importance in analysis of rockfill dams. Since the dimensions of grains in such materials are greater than the conventional sizes suitable for soil mechanics tests, it is necessary to experimentally study them in specific large-scale apparatuses. In this research, the behavior of rockfill materials in two large rockfill dams constructed in northwest of Iran were studied using large-scale direct shear and triaxial tests. Various indices regarding the quantity of particle breakage in rockfill materials were assessed for both dams and an experimental correlation has been proposed between the Los Angeles Abrasion Value and internal friction angle of rockfill material. Also, the effect of surcharge intensity, grain size distribution and degree of compaction on the shear strength of rockfill material for both dams was studied. The findings indicate that increase in particle breakage leads to reduction of internal friction angle. Also, for a specific sample the particle breakage index increases with an increase in surcharge, percentage of gravel and degree of compaction.


Brauns, J. and Kast, K. (1991). “Laboratory testing and quality control of rockfill- german practice”, Advances in Rockfill Structures, NATO ASI Series, 195-219.
Cambridge, M. (2008). “Implications of pyritic rockfill on performance of embankment dams”, Dams and Reservoirs, 18(2), 63-69.
Charles, J.A. and Walts, K.S. (1980). “The influence of confining pressure on the shear strength of compacted rockfill”, Geotechnique, 30(4), 353-367.
Delgado Rodrigues, J. (1991). Physical characterization and assessment of rock durability through index properties, Chapter 2, Advances in Rockfill Structures, Kluwer Academic Publishers, Netherlands, NATO ASI Series, 200, 7-33.
Ghanbari, A., Sadeghpour, A.H., Mohamadzadeh, H. and Mohamadzadeh, M. (2008). “An experimental study on the behavior of rockfill material using large scale tests”, Electronic Journal of Geotechnical Engineering, 13, Bundle G.  1-16.
Gupta, A. (2009). “Effect of particle size and confining pressure on breakage and strength parameters of rockfill material”, Electronic Journal of Geotechnical Engineering, 14, Bundle H. 1-12.
Hamidi, A., Yazdanjou, V. and Salimi, S.N. (2009). “Shear strength characteristics of sand-gravel mixtures”, International Journal of Geotechnical Engineering, 3(1), 29-38.
Hamidi, A., Salimi, S.N. and Yazdanjou, V. (2011). “Gravel particles shape and size effects on shear strength characteristics of fine sands”, Scientific Quarterly Journal of Geosciences, 20(80), 189-196.
Hazen, A. (1911). Discussion of “dams on sand foundation”, by A. C. Koenig, Transactions, American Society of Civil Engineers, 73, 199.
Indraratna, B., Wijewardena, L.S.S. and Balasubramaniam , A.S. (1993). “Large –scale triaxial testing of greywacke rockfill”, Geotechnique, London, U.K. 43(1), 37-51.
Indraratna, B., Ionescu, and Christie, H.D. (1998). “Shear behavior of railway ballast based on large –scale triaxial tests”, ASCE Journal of the Geotechnical Engineering Division, 124(5), 439-449.
Indraratna, B. and Salim, W. (2002). “Modelling of particle breakage of coarse aggregates incorporating strength and dilatancy”, Proceedings of the ICE - Geotechnical Engineering, 155(4), 243 –252.
Kim, Bum-joo. (2005). “Shear strength and one-dimension compression characteristics of granitic gneiss rockfill dam material”, 21(7), 31- 42.
Lade, P.V. (1996). “Significance of particle breakage in granular material”, Journal of Geotechnical Engineering, ASCE, 122(4), 309-316.
Lee. K. and Farhoomand, I. (1967). “Compressibility and breakage of granular soil in anisotropic triaxial compression”, Canadian Geotechnical Journal, IV(1), 68-86.
Leslie, D.D. (1963). “Large scale triaxial tests on granular soils”, Proceeding of the 2nd Pan-American Conference on Soil Mechanics and Foundation Engineering, Brazil, 1, 181-202.
Leslie, D.D. (1975). “Shear strength of rockfill. physical properties engineering study”, South Pacific Division Corps of Engineers Laboratory, 526, 124, 1975.
Marsal, R.J. (1967). “Discussion of shear strength”, Proceedingof the 6th International Conference on Soil Mechanics and Foundation Engineering, 3, 310-316.
Parkin, A.K. (1991). “Rockfill modeling”, Advances in Rockfill Structures, NATO ASI Series, 35-51.
Varadarajan, A., Sharma, K.G., Venkatachalam, K. and Gupta, A.K. (2003). “Testing and modeling two rockfill material”, ASCE Journal of the Geotechnical and Geoenviromental Engineering, 129(3), 206-218.