• You didn't give the mechanical properties of the clay. It's impossible to answer without that information. If there was just loose blobs of clay with that unit weight on top, your bore hole would obviously make a geyser that would spray 23.8 m (P = rho g h, assuming rho = 997 kg/m3 for fresh water is applicable) from the interface, or 11.3 m above the ground level. Obviously, that's not realistic, since stiff clay is cohesive and has elastic stiffness to it, so the pressure on the water table is not that great. On the other hand, if the clay was perfectly cohesive and adequately stiff, though, the excavation would not have failed. You probably have tables with numbers to use for your calculations that you didn't think to share.
  • Is this a test question?

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