1. American Society for Testing and Materials (ASTM), Standard Test Method for Particle-Size Analysis of Soil. ASTM D422-07 )2007(. 2. American Society for Testing and Materials (ASTM), Standard Test Methods for Minimum Index Density and Unit Weight of Soils Using a Vibratory Table. ASTM D4254-12 (2007). 3. American Society for Testing and Materials (ASTM), Standard Test Methods for Maximum Index Density and Unit Weight of Soils and Calculation of Relative Density. ASTM-D4253-12 (2012). 4. American Society for Testing and Materials (ASTM), Standard Test Method for Specific Gravity of Soil Solids by Water Pycnometer. ASTM-D854-12 (2012). 5. American Society for Testing and Materials (ASTM), Standard Test Method for Determining the Coefficient of Soil and Geosynthetic or Geosynthetic and Geosynthetic Friction by the Direct Shear Method. ASTM-D5321-08 (2008). 6. Hamidi A., Yazdanjou V., Salimi N., "Shear Strength Characteristics of Sand-Gravel Mixtures", International Journal of Civil Engineering, 3 (1) (2009-a) 29-38. 7. Hamidi A., Alizadeh M., Soleimani S. M., "Effect of Particle Crushing on Shear Strength (2009-b). 8. Simoni A., Houlsby G. T., "The direct shear strength and dilatancy of sand-gravel mixtures, Geotechnical Engineering Journal, 24(3) (2006) 523-549 9. Mohr O., "WelcheUmstandeBedingen die Elastizitatsgrenze and den Bruch einesMateriales", Zeitschrift des VereinesDeutcherIngenieure, vol. 44, pp. 1524-1530 (1900) 1572-1577. 10. Kim D., Ha S., "Effect of Particle Size on the Shear Behavior of Coarse Grained Soil Reinforced with Geogrid", materials, volume 7 (2014) 963-979. 11. Hamidi A., Azini E., Masoudi B., "Impact of gradation on the shear strength-dilation behavior of well", Scientia Iranica, 19(3) ((2012)) 393-402.