ABSTRACT
In order to calculate bearing capacities of foundations installed in the ground, surcharges due to soil weight has to be known as a boundary stress condition. Equivalent surcharges are conventionally assumed to calculate them. However, the boundary condition seems to influence on the calculation results. In this paper, a formula for the proper surcharge distribution which can take account of an effect of frictions at interface between the foundation and the soil is proposed, and then the formula is introduced into the bearing capacity calculations. As a result of the calculations, reductions in the bearing capacities are observed.
