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Encyclopedia > Pore water pressure

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. Groundwater is water located beneath the ground surface in soil pore spaces and in the fractures of geologic formations. ... Loess field in Germany Soil horizons are formed by combined biological, chemical and physical alterations. ... The rocky side of a mountain creek near Orosí, Costa Rica. ... A pore, in general, is some form of opening, usually very small. ... In the earth sciences, permeability (commonly symbolized as κ, or k) is a measure of the ability of a material (typically, a rock or unconsolidated material) to transmit fluids. ... Fluid pressure is the pressure on an object submerged in a fluid, such as water. ...

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. Soil mechanics is a discipline that applies the principles of engineering mechanics to soil to predict the mechanical behavior of soil. ... Karl von Terzaghi (Prague, October 2, 1883 – Winchester, Massachusetts, October 25, 1963) was an Austrian civil engineer, called the father of soil mechanics. ... Effective stress (σ) is a value reflecting the strength of a soil. ...

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