Interaction between a barrette and multilayered surrounding and underlying soils, taking into account their elastic and elastic-viscoplastic properties

Introduction. Upon interaction between a single barrette with underlying and loose surrounding soils the settlement of the barrette can occur for a long period of time. Therefore, the prediction of barrette settlement in time is significantly essential for building, foundation analysis and design under such geological conditions. As a result, it is vitally necessary to consider rheological processes of soils the cause of the change of barrette settlement in time. In order to clarify the abovementioned problem the setting and solutions to the problem of the interaction between a single barrette and elastic-viscoplastic surrounding and underlying soil are presented. The result indicates that the viscocity of surrounding soils greatly affects time-dependent settlement curves of a vertically loaded barrettle. Materials and methods. The problem is considered in a linear formulation. The solution is acquired in analytical method. To figure out the changing in time process of barrette settlement, constant and variable coefficients of viscosity of soils are applied. Results. The expressions are obtained to determine barrette settlement, friction forces on side surfaces of the barrette and reaction forces under the barrette heel. The relationship between the reaction forces under barrette toe; barrette settlement and the time are derived in regard to elastic-viscoplasticity of multilayered surrounding soil. Acquired results are presented by graphs in the article. The graphs demonstrating abovementioned relationships are provied according to various values of constant and variable coefficients of viscosity of soils. Conclusions. The acquired solution can be applied to determine vertical displacement of a barrette when interacting with an elastic as well as elastic-viscoplastic heterogeneous soil mass. Coefficients of viscosity of surrounding soil have a significant effect on the rate of barrette settlement and stress under the barette heel. Taking into account the increase in the coefficients of soil viscosity over time affects greatly the values of long-term settlement of the barrette, as well as pressure under the barrette toe. As a result, it is possible to predict the values of stabilized settlement as well as long-term bearing capacity of a barrette interacting with an elastic-viscoplastic heterogeneous soil mass.