Numerical Simulation of Dynamic Testing of Soils by Piles

Abstract

The aim of the study is to simulate dynamic processes during dynamic testing of soils by piles, as a result of which a vibration effect occurs on the surrounding soil mass, as well as to compare the results obtained with field tests. Dynamic tests carried out at the construction site of the «Northern Lights» residential complex, as well as hydrogeological conditions of the construction site under study, were taken as the initial conditions of the simulation. Numerical modeling makes it possible to carry out theoretical studies that are not always practical, and sometimes simply impossible. The basic concept of the finite element methods (FEM) is that the desired continuous value, the displacement of points of a deformed body, is approximated by a piecewise set of functions defined over bounded finite elements. The article presents the results of vertical movements of the pile, in which the increment of the pile sediment decreases with each impact, which is typical for piles resting in sandy soils. The results of comparisons of failures of the obtained FEM and dynamic tests of five piles showed a close relationship with the average deviation of the values of failures of the obtained FEM by 22% from dynamic tests.