Nowadays various dynamic loads including pile sinking, vibropiling and intensive traffic circulation have a considerable effect on subsoils in case of modern urban development. Dynamic effects might cause additional settlements of foundations of already built structures surrounding a building site. It has been established that dynamic loading leads to liquefaction of sandy soils in certain cases. For this purpose, the experimental research of soil behavior under dynamic effect is a relevant objective.The article deals with integrated laboratory study of the sandy soil samples of different fineness and dry density under the conditions of triaxial dynamic compression. The experiments were performed with a modern dynamic triaxial compression unit, which allows to simulate various modes of static and dynamic loadings of soil samples. As controlled variables in the research vertical and horizontal static stresses ratio, frequency and amplitude were considered. The degree of soil deformation characteristics dependence of particle size distribution and water-saturation degree in case of dynamic loading is specially noted. Critical values of dynamic stresses were obtained. Changes in the soil sample's structure and strain accumulation caused with dynamic dresses were taken into account. The results of the research are presented in a graphical form. Due to the results of the research practical recommendations on building sustainability assessment in case of dynamic loading are given. The veracity of the results is verified with the massive volume of data, that was gotten during the experimental research. Precision of experimental and calculation results has been observed. The results of the research might be applied by civil engineers in foundation design in case of dynamic loading and development of activities for engineering protection of vibration effects.
Kondratieva et al. (Thu,) studied this question.