Before revision: He examined the effect of footing interference on ultimate bearing capacity of strip footings by theoretical analysis using limit equilibrium method, assuming a non-linear failure surface wherein the cross section composed of logarithmic spiral and straight line portion tangent to the curvilinear portion.
After revision: He examined the effect of footing interference on ultimate bearing capacity of strip footings by theoretical analysis using limit equilibrium method, assuming a non-linear failure surface wherein the cross-section composed of logarithmic spiral and straight line portion tangent to the curvilinear portion.