When using a pore pressure grid, is there a way to exclude a material?

When using a pore pressure grid, if you do not want pore pressure in a particular material, simply turn off the grid in the material properties dialog.

 

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Option to turn off pore pressure grid in material

 

If the Grid (Pore Pressure) option is On, pore pressures will be computed from the grid for any surface going through that material. Values outside the pore pressure grids will be extrapolated.