Subsoil parameters for subsoil under a slab

The parameters of subsoil for subsoil defined under a slab are:

C1z	resistance of environment against normal displacement uz (mm) [C1z in MN/m3]
C2x	resistance of environment against rotation duz/dx (mm/m or mrad) [C2x in MN/m]
C2y	resistance of environment against rotation duz/dy (mm/m or mrad) [C2y in MN/m]
C1x	resistance of environment against tangent displacement dux (mm) [C1x in MN/m3]
C1y	resistance of environment against tangent displacement duy (mm) [C1y in MN/m3]

Note: All displacements are expressed according to 2D member LCS

Note: Usually, C2x is considered equal to C2y and C1x equal to C1y.