======================================================================
AXIAL COMPRESSION
======================================================================

3-D axial compression test with trilinear hexahedral cells.

-200 m <= x <= +200 m
-200 m <= y <= +200 m
-200 m <= z <= +200 m


         Uz=-1.0 m
         ----------
         |        |
Ux=0.0 m |        | x=0.0 m
Uy=0.0 m |        | y=0.0 m
         |        |
         ----------
         Uz=+0.0 m

Dirichlet boundary conditions
  Ux(+-200,0,0) = 0.0 m
  Uy(0,+-200,0) = 0.0 m
  Uz(0,0,+200) = -1.0 m
  Uz(0,0,-200) =  0.0 m

Analytical solution
  Ux(x,y,z) = 0
  Uy(x,y,z) = 0
  Uz(x,y,z) = -0.0025 * (z + 200)


======================================================================
SHEAR
======================================================================

3-D shear test with trilinear hexahedral cells.

-200 m <= x <= +200 m
-200 m <= y <= +200 m
-200 m <= z <= +200 m


           ----------
           |        |
Ux= 0.0 m  |        | Ux= 0.0m
Uy=-1.0 m  |        | Uy=+1.0m
Uz= 0.0 m  |        | Uz= 0.0m
           ----------


Dirichlet boundary conditions
  Ux(+-200,0,0) =  0.0 m
  Uy( -200,0,0) = -1.0 m
  Uy( +200,0,0) = +1.0 m
  Uz(+-200,0,0) =  0.0 m

Analytical solution
  Ux(x,y,z) =  0.0
  Uy(x,y,z) = -0.004 * x
  Uz(x,y,z) = -1.0 + 0.005 * (x + 200)
