What are the factors that affect shear strength of cohesion less soils?

The factors that affect the shear strength of cohesion-less soils are as follows

1. Shape of particles
2. Gradation
3. Confining pressure
4. Deviatoric stress, 
5. Vibration 
6. Repeated loading and type of minerals are the factors that affect  shear strength of cohesion less soils.