Validation of Rayleigh Wave Theoretical Formulation with Single-Station Rotational Records of Mine Tremors in Lower Silesian Copper Basin

Witold Pytel,Krzysztof Fuławka,Bogumiła Pałac-Walko,Piotr Mertuszka

doi:10.3390/s21103566

Abstract

The classical Rayleigh surface rotational wave in terms of its theoretical notation and, resulting from this, properties associated with the induced seismic phenomena in mines are presented. This kind of seismic wave was analysed in-depth from the point of view of the parameters governing the form of its mathematical notation based on the similarity to the records obtained during the induced seismicity in near-field 6-DoF monitoring. Furthermore, conducted field measurements made it possible to relate the amount of the emitted seismic energy to the expected highest amplitude of rotational vibrations in the entire field of their impact on the rock mass. As a result, this made it possible to impose the completely defined R wave to the numerical models of given objects; the safety level, when subjected to the dynamic load induced by the rotational wave, would be an objective of the performed analyses. The conducted preliminary analyses were prepared for a plane strain state, for which the values of seismic rotations were evaluated concerning the energy and the distance of the seismic event’s source. As a result of the performed simulations, it was found that the results of the calculations matched with a satisfying degree with the field seismic measurements of the rotational ground motion induced by propagating the seismic wave. Such a verified analytical description of the theoretical formulas can be the basis for the implementation of R-wave characteristics into seismic codes and numerical analyses of object stability in the Lower Silesian Copper Basin region.

Highlights

Published: 20 May 2021Seismic activity is one of the deadliest and destructive source of hazards affecting both the local society and the environment
One can say that the results of the calculations presented above show that the risk of the R wave for the stability of the structure on the surface is closely related to the amount of energy emitted from the seismic phenomenon, the distance at which it occurred and the value of the dominant frequency of the seismic wave itself
This paper presents the theoretical models describing Rayleigh surface waves, characteristic for the near-field to the seismic source, and field measurements based on verified and validated information

Summary

Introduction

Published: 20 May 2021Seismic activity is one of the deadliest and destructive source of hazards affecting both the local society and the environment. Seismic events may be divided into natural and anthropogenic ones [1,2,3,4]. Regardless of the type of seismic event, the additional dynamic load may generate a significant damage to structures located near the seismicity source. As it was pointed out by Albano et al [3], with the rise of the intensity of anthropogenic earthquakes, an increased number of unexpected damages is being observed [8,15,16,17]. Many of them are directly related to seismic load occurrences that caused a lot of tragic social, economic and environmental loses [18,19]

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