Viscous resistance of clay soil under kinematic shear
Viscous resistance of clay soil under kinematic shear
Based on the concept proposed by N.N. Maslov, the ultimate shear resistance of clay soil can be represented as the sum of Coulomb friction, structural cohesion and cohesion of water-colloidal bonds. However, this concept doesn’t take into account the influence of shear rate. Note that during kinematic shear in a soil medium that has viscosity, viscous resistance may appear. In this regard, within the framework of this work, it was proposed to present the general cohesion in clay soil as a sum of three components: structural cohesion, cohesion of water-colloidal bonds and viscous soil resistance. To take into account the influence of shear rate on the shear resistance of clay soil, experimental studies were carried out on samples of clay soil in a simple shear device in a kinematic loading mode. The tests were carried out at four different shear rates and at three different values of constant vertical load. The design of the simple shear device used during testing allows for the realization of a homogeneous stress-strain state inside the soil sample during testing, since each individual elementary layer of the sample moves by the same amount during shear. Based on the results of experimental and theoretical studies, a new rheological equation was obtained, which simultaneously takes into account the influence of Coulomb friction, structural cohesion, cohesion of water-colloidal bonds and viscous resistance of the soil. The resulting equation can be used for further improvement of methods for quantitative assessment of the stress-strain state of foundations composed of weak clay soils.
Armen Zarven Ter-Martirosyan; L. YU. Ermoshina
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
A - New developments on structural design
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