... the sand piles itself, the overall shear strength of the composite ground being taken to be some weighted average of that of the sand pile and the in-situ strength of the soft clay This often ... cylindrical surface of sand pile, s the internal friction angle of sand, and u the upper yield stress of clayey ground If one further assumes that the stress conditions of clay and sand in the unit ... Kc are the coefficients of earth pressure in the sand column and clay, respectively, ds the diameter of the sand column, and Es and Ec the Young’s modulus of the sand and clay, respectively The...