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Water Height

Unlike the overburden thickness, the Water Height is the height measured from the bottom of the pillar, so that the water pressure can be taken into account if the pillar is specified as "permeable".

Depending on the relative water height, the permeability of the pillar, and the lateral stress option, various situations will arise.

If pillar is "impermeable"

  • Water height < (pillar + overburden thickness) will have no effect.
  • Water height > (pillar + overburden thickness) will add a deadload due to the weight of the free water.

If pillar is "permeable"

  • Water pressure will reduce the lateral effective stress if the Lateral Stress option = Gravity.
  • If the water height is more than about twice the pillar height, negative effective stresses will result, and a warning will be displayed when attempting to Compute.
  • If water height > (pillar + overburden thickness), and lateral effective stresses are not negative, then the weight of the free water will still add an extra deadload component to the pillar load.

If Lateral Stress option = Constant

Water height will have no effect on the lateral stress, since the user is already entering effective stresses. If water height > (pillar + overburden thickness), then the deadload due to the weight of the free water will still be calculated.

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