Modeling elastic-dynamic effects of the crust under nuclear power plant (on the example of Chornobyl NPP)

2015;
: pp. 45 - 54
https://doi.org/10.23939/jgd2015.01.045
Received: April 15, 2015
1
Lviv State University of Life Safety; Scientific-Research Institute "Naukanaftogaz", Subbotin Institute of Geophysics of the National Academy of Sciences of Ukraine)
2
Subbotin Institute of geophysics of National Academy of Sciences of Ukraine
3
Subbotin Institute of geophysics of National Academy of Sciences of Ukraine
4
Department of Seismicity of the Carpathian Region, Subbotin Institute of geophysics of National Academy of Sciences of Ukraine
5
Department of Seismicity of the Carpathian Region, Institute of Geophysics named after S.I. Subbotin of the National Academy of Sciences of Ukraine
6
Department of Seismicity of the Carpathian Region, Institute of Geophysics named after S.I. Subbotin of the National Academy of Sciences of Ukraine
7
Department of Seismicity of the Carpathian Region, Institute of Geophysics named after S.I. Subbotin of the National Academy of Sciences of Ukraine

Purpose. The aim of study is to create the method of seismic wave fields modeling for a broad class of vertically and horizontally inhomogeneous layered media. Simulation will make it possible to more precisely assess the characteristics of sedimentary strata in the study of the transmission characteristics of the environment under the engineering structures. Methodology. At modeling in engineering seismology should be used a wide frequency range (from 0 to 200 Hz) to study all possible effects on engineering structures. While solving the direct problem need to use mathematical modeling techniques that allow taking into account the different types and forms of inhomogeneities, as well as the complex structure of the sedimentary layer. The research was conducted by solving the direct dynamic problem of seismic with finite element method. This method of mathematical modeling allows calculations for models which are complicated in their structure. When solving the direct dynamic problem of seismicity with this method, wave propagation are calculated for each time point, so do not lose the ability to consider different exchange effects inside the model and also we can calculate models with different complex geometric structure and various inclusions. For simulations were used existing two-dimensional models. When setting signal as close to the  -impulse, we get the response in full possible frequency range of model without additional processing output results. Results. The software package for mathematical modeling of seismic wave field was created. A result of modeling are obtained field of displacements, velocities of displacement, acceleration, as well as appropriate frequency characteristics for this model. Originality. The software package obtained allows investigating dynamic characteristics and resonance frequencies of the sedimentary layer in interactive mode. Practical significance. Based on the results of research, the wave field and the frequency response of the sedimentary layer under the engineering structure were obtained. Analysis of frequency characteristics of environment provides a resonant frequency to be considered in the design of large engineering structures.

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