عبدالرضا فاضلی

In the present research, the bearing capacity of foundations located on the homogeneous rock masses in seismic mode as well as the foundations located along the rocky slope have been investigated. Stress characteristics method is used in order to study the bearing capacity. The issue is analyzed in the case of plane strain and axial symmetry. Moreover, the Hook – Brown 1980 and the overall failure Hook – Brown are used as failure criterion. In the first stage, stress equilibrium equations have been rewritten on the stress characteristics. Then, rock fracture criterion has been applied in them. Stress equations are solved using finite difference method. The general solution to the problem is similar to conventional specifications except using momentarily changes of the radius of Mohr circle instead of momentarily friction angle. In order to analysis, a number of codes are written that are capable to solve and plot the network of stress characteristics and calculate the stress distribution below the foundation by taking the rock and foundation parameters. The foundation bearing capacity is calculated by integration the stress distribution below the foundation. The effects of earthquake have been applied as horizontal and vertical quasi-static coefficients. The bearing capacity has been investigated in both cases of no weight rock mass and rock mass weighted. What’s more, positive impact of considering the weight of rock masses on bearing capacity is proved. The foundations located along the rocky slope have been investigated and it is showed that the more the rocky slope increased, the more the ultimate bearing capacity decreased. Finally, the effect of earthquake coefficient and weight as well as the geomechanical parameters on bearing capacity has been examined and a number of graphs are provided in order to simplification the design process. By using the graphs, static and dynamic bearing capacity of foundations located on the rock masses as well as along the rocky