that the structural changes due to pressure deficiencies behave differently from changes due to applied stress.

Description

The effective stress () acting on a soil is calculated from the total normal stress () and pore water pressure () according to:

:This equation is fundamental in understanding the strength of soils under drained conditions, which applies to coarse-grained soils (sand, silt) and fine-grained soils (clay) over the long-term. This is because soil strength

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