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Paraseismic resistance evaluation for existing steel conveyor bridge subjected to mining tremors

Rusek Janusz, Słowik Leszek, Rataj Dagmara

Archives of Mining Sciences

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2022

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Vol. 67, no. 4

603--630

EN

The paper presents the author’s approach to evaluating the dynamic resistance of existing building structures exposed to the action of paraseismic events. The idea of the approach was demonstrated in the example of an existing conveyor bridge, which is an important component of an industrial plant located in an area threatened by the occurrence of mining tremors. A scenario was analysed in which the object’s structure was not adapted to absorb additional dynamic effects. Therefore, it was necessary to determine the load-bearing capacity reserve within which the dynamic effects induced by a mining tremor could be allowed. As part of the analysis, criteria for selecting the authoritative section of the analysed object for further dynamic calculations were established and described in detail. As a result of the implemented evaluation procedure, the limiting values of the ground acceleration components were obtained, which are understood as the resistance of the analysed object in the context of carrying additional dynamic actions induced by a tremor. The determined resistance is included in the ultimate limit state STR framework, which sets the level of strength of particular structures’ components as a criterion. The limit values of the ground acceleration components were calibrated, taking into account other accompanying variable actions according to the Eurocodes guidelines. The study also justified using this approach and provides essential information about dynamic excitation’s most sensitive structural components. Such information can direct the process of retrofit or necessary strengthening of the structure when the evaluated resistance will exceed the intensity of existing or predicted seismic events in the area.

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Wykorzystanie badań współczesnej aktywności tektonicznej do oceny chwilowego poziomu zagrożenia zdarzeniem sejsmicznym na obszarach wydobywczych Polski i Czech (komunikat)

Kaczorowski Marek, Rudnicki Marcin

Bezpieczeństwo Pracy i Ochrona Środowiska w Górnictwie

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2020

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nr 7

16--19

PL

Artykuł przedstawia wyniki badań aktywności tektonicznej prowadzonych przez Laboratorium Geodynamiczne CBK PAN w kontekście możliwości wdrożenia nowej metody pomiarowej na rzecz monitoringu zagrożeń w górnictwie węgla kamiennego i miedzi.

EN

Recognition of high coincidence of intervals of Iow velocities of Świebodzice Depression deformation with intervals of seismic events in underground mines (for ca. 140 of strong events in 2006-2016) supports the concept of a large-scale tectonic force field, which source area is the Atlantic rift system. This field covers areas of the Świebodzice Depression, Fore-Sudetic Monocline, Upper Silesian Basin and Bohemian Massif, which explains the cause of the observed coincidence. Practical application of the findings described (called „TAF method") allows for determining the so-called PGZ parameter - momentary susceptibility of rock massif to destruction. The PGZ parameter allows to assess the momentary level of seismic shock threat at a several level scalę. The TAF method may be applied to determine intervals of increased seismic shock threat almost in real time after modernisation of the registration process. To achieve this, analogous modules should be replaced by digital measurement systems. Application of the TAF method should improve exploitation safety in underground mines and selection of optimal moments for rock massif release (with application of blasting method) in intervals of high PGZ values, i.e. large susceptibility of rock mass to destruction.

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Wybrane problemy obserwacji drgań i estymacji energii zdarzeń sejsmicznych. Czujniki drgań i zagadnienie detekcji

Kornowski J., Gołda I.

Górnictwo i Geologia

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2011

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T. 6, z. 3

87-113

PL

Artykuł ten jest rozwinięciem poprzedniej pracy autorów [14] o obserwacyjnych podstawach oceny zagrożenia sejsmicznego w górnictwie, z tego też powodu ma częściowo dydaktyczny charakter. Zajmujemy się tu opisem właściwości układów pomiarowych sejsmologii górniczej i sejsmoakustyki, a w szczególności ich czujnikami oraz analizą założeń, które decydują o jakości interpretacji pomiarów, zatem pośrednio o jakości ocen zagrożenia.

EN

This is a continuation of the our previous paper [14] about analyzing observational problems of seismic emission in mining, where the observations are to be useful for seismic/rockburst hazard assessment. Stressed are differences between a seismometer and geophone and some elementary but very important (and undervaluated in practice) notions and issues of event detection are discussed.