Settlement and long-term bearing capacity of the pile taking into account the rheological properties of soils

Abstract

A large number of scientific works by both Russian and foreign authors are devoted to the interaction of a single pile with the surrounding and underlying soils. Based on experimental, numerical and theoretical studies, various methods, approaches and solutions have been obtained in scientific works, which make it possible to most correctly predict the settlement and bearing capacity of a single pile. Research in this area is relevant, since the determination of the settlement of the pile, as well as the study of the mechanism of distribution of the load transmitted to it, play an important role in the design of pile foundations. In this work, the boundary value problem of the interaction of a long and incompressible pile with the surrounding and underlying soils in an elastic-viscous formulation, taking into account soil strengthening, was solved, based on the Maxwell model, as well as on the basis of the rheological model of A.Z. Ter-Martirosyan. This study presents a detailed course of solving the boundary value problem, as well as the basic formulas for calculating the settlement and long-term bearing capacity of a single pile. The change in the curve of dependence σ R ( t ) at different values of soil viscosity is shown when solving the problem in an elastic-viscous formulation. An additional graph of σ R ( t ) dependence is presented showing the difference in the presented soil models. Based on the plotted graphs of the dependence of σ R ( t ) when solving the problem in an elastic-viscous formulation, it can be concluded that the time to reach the maximum value of the load under the foot of the pile is directly proportional to the value of the soil viscosity. When solving the problem on the basis of the rheological model A.Z. Ter-Martirosyan, the maximum value of the load under the foot of the pile is reached earlier than when solving the problem in an elastic-viscous formulation both with and without soil strengthening, which requires additional study.