Based on the logarithmic spiral failure surface and combined with the upper bound theorem of soil plasticity mechanics

a technique of slice for analyzing translational failure mechanism of the stability problem of strip foundations subjected to uplift loads was proposed. According to the term that the rate of work done by external loads and soil weight is equal to the rate of energy dissipation in the kinematically admissible velocity field

the virtual work rate equation was deduced

through which the vertical uplift capacity can be calculated. Bearing capacity factors have been determined which showed that the part of uplift capacity corresponds to cohesion is affected by respond coefficient m and the other two parts which correspond to surcharge and weight separately

can hardly be affected by it. Through the comparision of results which obtained by predecessor's experimental materials and Meyerhof and Adams’s computation theory

the correction and feasibility of the suggested method is indicated

and the conclusion that m only affects cohesion term Fc remarkably is validated by the results in sand and cohesive soils.