The concept of effective stress truly becomes interesting when dealing with non-hydrostatic pore water pressure.
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The pore water pressure is essential in differentiating a soil's total stress from its effective stress.
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Pore water pressure is the pressure of water that is trapped within the particles of rocks and soils.
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Alternatively, shear strength may be decreased by weathering, changes in pore water pressure, and organic material.
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Normally, effective normal stress is calculated by subtracting the pore water pressure from the normal stress, in natural conditions.
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Among other academic writings, he formulated concepts such as that of A and B pore water pressure coefficient which is still widely used today.
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Realistically, the effective stress is greater than the total stress, as the pore water pressure in these partially saturated soils is actually negative.
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The increased moisture content of bioreactor landfill may reduce the structural stability of the landfill by increasing the pore water pressure within the waste mass.
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In areas of high pore water pressure, sand and salt water can form quicksand, which is a colloid hydrogel that behaves like a liquid.
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The specifics relevant to your question are at pore water pressure and bearing capacity . talk ) 19 : 10, 14 October 2014 ( UTC)