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Stress-state monitoring of coal pillars during room and pillar extraction

Waclawik P., Ptacek J., Konicek P., Kukutsch R., Nemcik J.

Journal of Sustainable Mining

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2016

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Vol. 15, iss. 2

73--83

EN

Current mining activities of the OKD mines are primarily focused on coal seams within the Karvina Formation in the Karvina sub-basin. A considerable amount of coal reserves are situated in protection pillars that lie under built-up areas. The longwall mining method is not applicable in these areas because significant deformation of the surface is not permitted. For this reason OKD is considering using alternative methods of mining to minimise subsidence. The room and pillar method has been trialed with specific coal pillars in order to minimise strata convergence. The method was implemented in the shaft protective pillar at the CSM Mine and is the first application of the room and pillar mining method within the Upper Silesian Coal Basin. Mining depth reached up to 900 m and is perhaps the deepest room and pillar panel in the world. To determine pillar stability, vertical stress was measured in two adjacent coal pillars which are diamond in shape and located within a row of pillars forming the panel. Two pillars diamond in shape and slightly irregular sides were approximately 860 m2 and 1200 m2 in size and 3.5 m high To measure the increase in vertical stress due to mining, four stress cells were installed in each coal pillar. Four 5level multipoint rib extensometers measured displacements of all sides within each monitored pillar. The results of stress-state and pillar displacement monitoring allowed pillar loading and yielding characteristics to be described. This data and other analyses are essential to establishing procedures for a safe room and pillar method of mining within the Upper Silesian Coal Basin.

2

Possibility of convergence measurement of gates in coal mining using terrestrial 3D laser scanner

Kukutsch R., Kajzar V., Konicek P., Waclawik P.

Journal of Sustainable Mining

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2015

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Vol. 14, iss. 1

30--37

EN

The application of laser scanning technology has increased recently in many different branches. The presented paper deals with an application of this technology in the mining environment. To verify the spatial changes (movements and deformations) of mining works this technology was deployed in situ at the selected mining workplace in the Czech part of the Upper Silesian Coal Basin. The main purpose of 3D laser scanning at Lazy Mine was to monitor the deformation of the roadway before approaching the longwall face on the selected tailgate. From the results of performed 3D scanning used it was possible to accurately define and quantify the floor lift area in front of the approaching coalface, observe measurable tilt of middle wooden props, capture documentable changes in floor dinting during the period between campaigns and monitor the deformation of steel arch support, confirming the influence of additional stress away from the goaf of previous longwall.

3

Stability of old mine workings of Jeroným Mine at Čistá, Sokolov District

Kukutsch R., Žůrek P., Kořínek R.

Prace Naukowe Instytutu Górnictwa Politechniki Wrocławskiej. Studia i Materiały

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2012

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Vol. 135, nr 42

67-74

EN

The Jeroným Mine, which is situated in the locality of Slavkovský les Protected Landscape Area, is a unique heritage site associated with mining in the 15th and 16th centuries. To make this mine working accessible to the public, it is necessary in the first place to stabilize underground voids and to ensure such internal microclimatic conditions that any degradation of the mine working and any hazard to workers performing restoration operations and later to visitors will not occur. The contribution deals with factors conditioning and affecting the stability of this system of mine workings.

4

Critical places at locality Cistá, mine Jeronym and their possible development

Kukutsch R.

Zeszyty Naukowe. Górnictwo / Politechnika Śląska

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2008

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z. 286

441-450

EN

Protection of technical cultural monument hasn't in the Czech Republic deep roots. And now it is still rare phenomenon, in many respects unpopular, because the monument care and protection is something that is necessarily linked to endowment titles, increased costs and many other measures. Therefore we have to activities, which are in last years and at present proceed at Mine Jeronym with regard to availability of funds, mark to the Czech ratios for quite extraordinary. However, it should be noted that the monumental care has virtually no influence on spatio - temporal changes in this mine. The aim of the contribution is the definition and description of the critical places of the mine, because owing to many factors is rock mass eroded and it acts of mining working with the presence of several places with potentially reduced stability. Critical places can be seen both in the underground, but also on the surface of surface units after the completion of mining activities at this mine.

PL

Ochrona zabytków przemysłowych w Republice Czeskiej nie jest głęboko zakorzenioną praktyką. Można powiedzieć, że jest zjawiskiem rzadkim, w wielu aspektach niepopularnym, ponieważ dbałość o zabytki przemysłowe i ich ochrona nieuchronnie pociągają za sobą problemy finansowe, zwiększone koszty oraz inne środki naprawcze. Dlatego też działalność prowadzona w kopalni Jeronym w ciągu ostatnich lat jest w Czechach czymś wyjątkowym, zwłaszcza zważywszy na słabą dostępności do funduszy i dotacji. Ponadto, należy podkreślić, iż dbałość o zabytek przemysłowy w żaden sposób nie wpływa na zmiany przestrzenne i warunki operacyjne kopalni. Celem niniejszej pracy jest identyfikacja oraz opis miejsc krytycznych w zabytkowej kopalni. Z uwagi na wiele czynników krytycznych, górotwór występujący w kopalni uległ erozji, co w wielu miejscach doprowadziło do zmniejszonej jego stabilności. Miejsca krytyczne są widoczne zarówno pod ziemią jak i w obiektach powierzchniowych kopalni, w których zakończono już eksploatację górniczą.