Abstract：Based on the Lade-Duncan failure criterion and a stress condition in plane strain state，the failure criterion for plane strains for cohesionless materials is proposed. By introducing a parameter of bonding stress ，the failure criterion is extended to that of cohesive-frictional materials. The formula is applied to the calculation of bearing capacity of foundation. The validity of the proposed formula for bearing capacity of foundations is verified by comparing the computed results with the test data. The failure criterion in plane strain takes on the same value of reference to others plane strain problems.
