By Eugeniusz J. Sobczyk (ed.), Jerzy Kicki (ed.), Piotr Saluga (ed.)
The foreign Mining discussion board is a ordinary occasion, hosted by means of the collage of technology and know-how in Cracow, Poland, bringing jointly a global team of scientists, together with these operating in rock mechanics and computing device engineering in addition to mining engineers. the themes are wide-ranging, together with papers on distant sensing to evaluate fundamental influence; remedy of sealed-off coal mine fires; sustainable improvement in mine closure; and tracking of ordinary dangers and questions of safety.
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Sample text
GIG, Katowice. , Bukowski P. 2005: Uwagi dotyczące wpáywu zawodnienia na ocenĊ skáonnoĞci górotworu do tąpaĔ dla obszarów granicznych kopalĔ czynnych i zlikwidowanych w GZW. Prace Naukowe Instytutu Geotechniki i Hydrotechniki Politechniki Wrocáawskiej 75, Seria Konf. 41, str. 49–58. [7] Bukowski P. 2002: The Water Storage Capacity of a Carboniferous Rock Mass and its Impact on the Flooding Process of Mine Workings in the Upper Silesian Coal Basin. Archives of Mining Sciences, No. 47, 3, pp. 385412.
In the GEO classification the depths larger than 700 m are scored with the highest number of points. SUMMARY The bump hazard is situated among natural hazards and occurs in the rock mass susceptible to bumps. Rock mass susceptibility to bumps results from natural factors (geological). These factors have been formed as an effect of a diastrofic and sedimentation development of a carboniferous basin in the USCB. The main natural factors determining the susceptibility to bumps and bump hazard are: an exploitation depth, thickness of an exploited bed, lithology, tectonics of a rock mass, geomechnical properties, rock mass watering.
Table 2. An approximate participation of main types of rocks of upper carboniferous in the USCB (%) Rocks Layers 100 and 200 Layers 301326 and 327406 Layers 407419 and 500 Layers 600, 700, 800 and 900 conglomerate 3 - 2 - sandstones 81 27 53 47 mudstones 6 39 25 38 claystones 6 26 11 12 coal shales <1 <1 <1 <1 coals 3 7 8 2 others <1 <1 <1 <1 The properties of coal of given bed and layout consisting of rocks surrounding the bed determine a bump occurrence (Bukowska red. 2009). In mining practice there are recognized cases when, despite the occurrence of sandstone layers with their thickness of several to few tens of meters in the vertical profile as well as presence of seismic activity connected with their destruction, bumps did not occur during tens of years of exploitation.