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block’s top surface. Figure 3 Geometry of the problem The horizontal ground surface is not loaded. The elastic – perfectly plastic Mohr-Coulomb model was assumed for the sand surrounding the block and the linear elastic model for concrete of the anchor block. The parameters of both models are listed in Table 1 . Table 1 Material parameters. sand concrete Young Modulus E [MPa] 80 30000 Poisson’s ratio ν [-] 0.25 0.20 Cohesion c [kPa] 0.0 - Friction angle Φ [ o ] 34 - Unit weight γ [kN/m 3 ] 18 25 Volume changes of soil at yielding are reflected by the value of