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Powered roof support – rock strata interactions on the example of an automated coal plough system

Herezy Ł., Janik D., Skrzypkowski K.

Studia Geotechnica et Mechanica

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2018

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Vol. 40, nr 1

46--55

EN

The study summarises the operating characteristics of the powered roof support (shield) used in an automated plough system. Investigated longwall support units were controlled automatically or by section engineers and positioned in the 'saw tooth' configuration with respect to the longwall face (automatic mode) or linear to the face. Shield pressure data have been analysed in order to identify the impacts of particular factors on the pressure increase profiles. The analysis was supported by the Statistica software to determine the statistical significance of isolated factors. Equations governing the leg pressure at the given time instant were derived and the roof stability factor 'g' was obtained accordingly, recalling the maximal admissible roof displacement method recommended by the Central Mining Institute (Poland). In the current mining practice, its values are used in monitoring of strata behaviour as indicators of shield–strata interactions, particularly in the context of roof control in longwall mining. It is vital that the method used should be adapted to the actual conditions under which the longwall is operated. In the absence of such adaptations, there will be major discrepancies in results. The conclusions section summarises the current research problems addressed at the Department of Underground Mining, in which the support pressure data in longwall operations are used. The first aspect involves the delineation of deformations of a longwall main gate about 100 m ahead of the face. The second issue addressed involves the risk assessment of roof rock caving or rock sliding in the tail gate. Another aspect involves the standardisation of local conditions to support the methodology of interpreting shield–strata interactions in the context of work safety. These methods are being currently verified in situ.

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Możliwości zastosowania klasyfikacji jakości górotworu RMR w warunkach polskiego górnictwa rud miedzi

Janik D., Juszyński D., Terpak D.

Rudy i Metale Nieżelazne Recykling

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2017

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R. 62, nr 5

3--9

PL

Jednym z podstawowych elementów planowania eksploatacji jest rozpoznanie górotworu. W artykule przedstawiono wybrane klasyfikacje jakości masywu skalnego do prowadzenia w nim robót górniczych. Klasyfikacje zostały przeanalizowane w aspekcie możliwości ich stosowania w warunkach IGOM.

EN

One of the basic elements of planning exploitation is the recognition of the rock quality The article presents selected classifications of rock mass quality for mining works. Classifications have been analyzed in terms of their applicability in Polish copper ore mining.

3

Przegląd metody wskaźnikowej przydatności masywu skalnego do celów górniczych RFRI w aspekcie możliwości wykorzystania w warunkach KGHM Polska Miedź S.A.

Janik D., Juszyński D., Gniewosz M.

Rudy i Metale Nieżelazne Recykling

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2015

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R. 60, nr 9

399--404

PL

Artykuł przedstawia możliwości wykorzystania wskaźnika RFRI (Roof-fall Risk Index) [1] w warunkach KGHM Polska Miedź S.A. Została przedstawiona klasyfikacja, na podstawie której wskaźnik ocenia stateczność stropu oraz praktyczność poszczególnych czynników w warunkach KGHM Polska Miedź S.A. Autorzy określają wady oraz zalety poszczególnych czynników oraz możliwości rozwoju metod wskaźnikowych, uwzględniając najnowsze dostępne źródła analizy danych, w tym metody z wykorzystaniem nieinwazyjnych badań kontrolnych.

EN

The article presents the possibilities of using index RFRI (Roof-fall Risk Index) [1] in conditions of KGHM Polish Copper Ltd. Was presented classification on the under which index assesses the stability of the ceiling and practicality of each factor in conditions of KGHM Polish Copper Ltd. The authors define the advantages and disadvantages of specific factors and opportunities sentinel methods, taking into account the latest available sources of data analysis, including methods with the use of non-invasive examinations.

4

1-Azidoalkylphosphosphonates - A Convenient Substrates for the Synthesis of N-Alkyl alfa-Aminoalkylphosphonates

Gajda T., Janik D.

Polish Journal of Chemistry

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2005

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Vol. 79 / nr 3

493-498

EN

Diethyl [1-(alkylamino)alkyl]phosphonates 5 have been efficiently synthesized via a two-step reaction of diethyl 1-azidoalkylphosphonates 1 with triphenylphosphine, followed by in situ transformation of thus formed phosphazenes2 into imines 4 by means of aldehydes and subsequent reduction of 4 with sodium borohydride in ethanol.