The influence of the sedimentary strata on the seismic oscillation on the teritory Tashlyk hydroelectric pumped storage power plant

https://doi.org/10.23939/jgd2018.01.091
Received: March 11, 2018
Revised: June 11, 2018
Accepted: June 27, 2018
1
Institute of geophysics of NAS of Ukraine
2
Subbotin Institute of Geophysics of National Academy of Sciences of Ukraine

Purpose. The aim of the paper is to study the influence of the filtering properties of the sedimentary strata on the seismic vibrations of construction or operational sites located in the territory of Ukraine. Methodology. The effect of the physical and mechanical properties of the sedimentary strata to the seismic effect on the free surface of the Tashlyk HEPSPP territory under possible seismic impacts with various maximum peak accelerations, which with a probability of 99% will not be exceeded for the next 50 years, is analyzed. The assertion was confirmed that the reduction of sediment thickness always improves the seismic conditions of construction. The results are obtained by simulating a soil layer reaction to seismic impacts using the ProShake software. Under simulation, the behavior of each layer of the seismic geological model of the soil strata was specified by the Kelvin-Voigt model (viscoelastic). Each layer of the seismic geological model of the soil thickness was characterized by parameters such as layer thickness, density, primary and shear wave velocities, nonlinear strain-dependent shear modulus, and damping ratio. The use of calculating the strain-dependent shear modulus and damping ratio allow us to take into account the nonlinear reaction of the soil strata to the seismic actions. Scientific novelty. It is shown that a decrease in the thickness of the sedimentary layer under the construction site does not always reduce the manifestations of seismic impacts. The profitability for eliminating the upper loose sediment layer should be assessed in each specific case. Designers need to take into account information about the filtering properties of the soil strata beneath the construction site, choosing the parameters of the designed structures such that they ensure their maximum stability under seismic influences. The change in the parameters of ground conditions under the construction site can significantly affect the seismic effect on its surface. Practical significance. The obtained data on the filtering properties of the soil strata in each of the study areas for which the quantitative characteristics of the seismic hazard are determined allow simultaneously to ensure the stability of the projected facilities and significantly reduce the cost of constructing earthquake resistant buildings that would avoid resonant amplification of seismic oscillations by sedimentary strata for fundamental periods on the designed structures.

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