Pore water pressure
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Pore water pressure refers to the pressure of groundwater held within a soil or rock, in gaps between particles (pores). For example, in a high permeability soil, the pressure would be close to hydrostatic in no flow conditions.
Pore water pressure (sometimes abbreviated to pwp) is vital in calculating soil strengths in soil mechanics. From Terzaghi's expression for the effective stress of a soil.
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