Shear strength of sands
Non cohesive soils have little or no cohesion due to relatively larger particle size and their shear strength is mainly dependent on the frictional resistance between the particles including the sliding and rolling friction as wall as interlocking of the granular structures. Therefore the contribution parameters in the formation of the shear strength of the granular soil such as sand is the internal frictional angle and the cohesion.
Upon the application of the load or at the construction stage the most critical condition with regard to shear strength of the non-cohesion soils occurs. Due to the high permeability of the soil any water contained in the voids at the time of construction or upon the application of he load will be drained out in case of non-cohesive soil. Due to which the shear stress parameter are with respect to effective stress not the total shear stress.