Transformation of Spectral Peculiarities of the Soil Response to Dynamic Impacts of Varying Value
Year: 2019
Type: article
Abstract: The aim of the work was the question of the prediction of soils and structures behavior during intensive impacts. Adequate study of nonlinearity, which is an immanent feature of natural phenomena, will make it possible to bring the corresponding anti-seismic measures closer to the real features of seismic effect manifestations during strong earthquakes. To assess the level of soil inelasticity directly, a special scheme of experimental research with a gas-dynamic pulse source GSK-6M was used. It has been determined that a high-frequency component prevails in the vibration spectrum of weak soil, caused by a close oscillator of high-energy source, which quickly attenuates with distance. A low-frequency component dominates in the vibration spectrum in the process of the influence of remote oscillator on the same soil. Analysis of the records of strong and destructive earthquakes, as well as the analysis of specially conducted experimental effects, showed that the area of spectra of the corresponding ground vibrations is not constant at inelastic phenomena. The study of formulas based on the consideration of various physical characteristics of soils and motion indicators in order to calculate the seismic intensity increment was conducted. The limits of physical applicability of the formulas developed based on taking into account various indicators of soil movements are established. The application of the formula, which considers the weighted average frequencies and amplitudes of ground vibrations (which characterize the non-linearity/inelasticity of soils), is physically most reasonable.
Source: Akustika
Language: English
Subfield: Mechanics of Materials
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W3036099243