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This study is concerned with the behavior of two convergent foundations resting on clay using three-dimensional plane strain finite element analysis. A Mohr-coulomb soil model was used to simulate soils using PLAXIS 3D V21, a finite element analysis software that perfectly simulates linear and plastic elastic behavior. The soil zone is divided into 10-node triangular points approach for calculating the mesh generation, with locally refined mesh near the foundations and very fine mesh near the domain boundaries. Differences in spacing between two foundations and new foundation depth are used to investigate their effects on settlement and tilt, the effect use skirted foundation as a new foundation. It was observed through numerical analysis that the interference affects the functions of the existing foundation and that the settlement and tilt decrease as the spacing between the two foundations increases. Also, increasing the depth of the new foundation leads to a decrease in the settling of the foundation and tilt. Also using a skirted foundation as a new foundation contributed in decrease risks of additional settlement and risk of tilt of existing foundation. [ABSTRACT FROM AUTHOR]