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Applying spatial statistical methods to predict ground vibration accelerations caused by induced seismicity

Bańka Piotr, Szuła Łukasz

Archives of Mining Sciences

2022

Vol. 67, no. 4

645--660

This paper presents the results of the research aimed at improving the accuracy of predictions regarding the maximum values of resultant components for horizontal ground vibration accelerations in areas threatened by induced seismicity. The presented solution proposes a spatial model of the ground vibration attenuation relationship based on the assumptions of the Joyner-Boore model. When performing statistical analyses to verify the models, great emphasis was placed on the correctness of applied estimation methods to meet the assumptions. The starting point for introducing spatiality into the models was the occurrence of spatial autocorrelation of the residual component when estimating the structural parameters of a model with the least-squares method. Spatial interactions were presented using weight matrices, the construction of which was based on the inverse of the distance between units. During the study, it was found that the estimated spatial model of the ground vibration attenuation relationship showed a much better match with empirical data compared to the classical Joyner-Boore attenuation model.

Analiza wyników badań schładzacza powietrza w aparatach regeneracyjnych typu W-70 i BG-4 plus

Bańka Piotr, Koszyk Mariusz

Bezpieczeństwo Pracy i Ochrona Środowiska w Górnictwie

2019

nr 7

9--13

W artykule przedstawiono wyniki badań dotyczących schładzania powietrza wdychanego przez ratownika pracującego w aparacie regeneracyjnym typu W-70 (za pomocą urządzenia SAT-2M firmy Faser) i aparacie regeneracyjnym BG-4 plus firmy Dräger. Badania przeprowadzono podczas ćwiczeń ratowniczych w komorze ćwiczeń OSRG Bytom – Zabrze, która wyposażona jest w specjalne pomieszczenie strefy cieplnej. Ich celem było określenie zależności czasu pracy w aparatach regeneracyjnych od temperatury otoczenia.

The article presents the results of tests of air coolers utilizing ice and Dräger cooling cartridges, working in the W-70 breathing apparatus (using the SAT-2M device by Faser) and in the Dräger BG-4 plus breathing apparatus. Since the selection of a proper cooler for the breathing apparatus, and the knowledge of the working time of the cooler, depending on the temperature in the mine heading, are significant problems, tests have been carried out to determine the hours worked by a single rescue officer (related to the operation time of the air coolers) depending on the temperature at the workplace. The test was carried out during a rescue drill in the OSRG Bytom - Zabrze testing chamber equipped with a specialized room room - a heat zone. During the test, the operation of the Dräger breathing apparatus was controlled every 15 minutes by opening the coolers and measuring temperaturę using a Dräger USF 9000 thermal imaging camera, starting with the initial state of -120C and ending with 200C, where the operation of the cooler ended. The ice melting process was similarly controlled during the test, i.e. by opening the coolers every 15 minutes, making sure that the that did not pour out, or that the remaining ice did not fall out. Despite the varied mass and size of the ice in the W-70 and BG-4 plus breathing apparatus, very good results of cooling time were obtained for inhaled air, which ranged from 128 to 225 minutes - depending on the temperature setting. The operating time of the Dräger cooling cartridge was shorter - results from 90 to 120 minutes were obtained, which pointed to better properties of the cooler containing ice.