FEM MODEL OF VIBRATION PROPAGATION IN THE SOIL CAUSED BY PREFABRICATED DRIVEN PILES

This paper discusses the analysis of vibration propagation in the subsoil in relation to the finite element method. Theoretical analyses of the problem mentioned in the title are of key importance in the design of geoengineering technologies involving impacts. These technologies involve prefabricated driven piles, which are extremely effective and readily used, especially in bridges. In order to rationally use the impacts in construction works, the extent of the impact and the magnitude of acceleration amplitudes generated in adjacent objects or engineering structures should be determined at first. The most important factor influencing the propagation of impacts is the phenomenon of damping of the propagating wave in the ground. The mechanism of damping proposed by Rayleigh was used in the analysis, which, when selecting the appropriate parameters of the model, is able to realistically simulate the observed phenomena. Ground, in which the propagation of impacts occurred, was described with the use of linear-elastic model. Modules of deformation correspond to the values of small deformations, which occur at the wave propagation in the subsoil. The impulse causing vibrations was caused by the falling hammer on the driven pile. The axial symmetry of the border condition was used in the analyses. The results of numerical simulations were compared with the results of field measurements of accelerations at different distances from the source of vibration. These results were the subject of another paper published at this conference. The obtained results will be used in the future to assess the extent of the impacts on the environment and values of acceleration on elements located in the vicinity of the structure.