ANALISIS OF SATURATED CLAY COMPRESSION ON THE BASIS OF THE MOHR-COULOMB CRITERION

G. P. Postoev^a,#

^aSergeev Institute of Environmental Geoscience, Russian Academy of Sciences, Ulansky per. 13, str.2, Moscow, 101000 Russia
^#E-mail: opolzen@geoenv.ru

The Mohr-Coulomb criterion, in terms of principal stresses, allows determining clay structural strength and horizontal stresses that control equilibrium in the point. With vertical pressure on the saturated soil not ex-ceeding the structural strength, the pressure is completely taken by pore water and through the pore water pass to mineral structure. At this stage the soil strength in the point remains the same and there are no horizontal stresses, excess pore pressure or filtration. With vertical pressure (and pore pressure as well) exceeding the values of clay structural strength, the excess pore pressure at a point emerges. Absence or lack of filtration leads to lateral pressure summing up excess pore pressure and effective values of horizontal stress at the point.

Regularities of changes in mobilized clay strength at a point on the basis of the Mohr-Coulomb criterion, in terms of principal stresses, are considered during virgin compression, with free filtration, under the influence of groundwater pressure.

Keywords: the Mohr-Coulomb criterion, principal stresses, lateral pressure, soil structure strength, excess pore pressure, groundwater pressure, filtration

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