National Repository of Grey Literature 8 records found  Search took 0.00 seconds. 
Long-term stability of underground openings with respect to their liquidation at the small and middle uranium deposits of the Moravian Moldanubicum (Olší-Drahonín, Jasenice-Pucov)
Hájek, A. ; Konečný, Petr
Securing of the long term stability of underground openings mouthing to the surface (shaft, drifts, galleries) is the basic presumption for the successful liquidation of an exhausted deposits. The calculation of stability for such openings in small and middle deposits of uranium was realised in connection with their closing. Opening deeper then approximately 30-50 m were taken under consideration.
Contribution to long-term observation of the seismic regime in the Ostrava-Karviná coal basin
Holub, Karel ; Rušajová, Jana
Seismic activity in the Ostrava-Karviná Coal Basin is continuously monitored by networks of seismic stations within the local as well as regional networks. Results of interpretation of seismic data proved the seismic method to be an valuable tool in geomechanical practice.
Rock Bursts in the Czech part of the Upper Silesian Basin when mining the seams under thick barren measures
Konečný, Petr
Rock burst events with focus area outside of the coal seam are desrcibed. Such rock bursts are in the Ostrava-Karviná Coal Basin usually induced by mining in stratigraphic lower seams with overlying 100 m thick solid roof zone developed without any workable coal seam. The process of rock massif failure in such conditions is described Deformation and failure connected with restoring new equilibrium condition could be manifested then by destruction even in mine workings located in considerable distance from rock burst focus zone.
Seismic response to mining reduction in Mines in the Ostrava-Karviná Coal Basin
Holub, Karel ; Stodulková, S.
Based on long-term seismic monitoring, the influence of mining reduction to the level of seismic activity was investigated. Using data from the period of temporary mining reduction (July 1999) and a month before and after this period proved the obvious decrease of seismic activity.
Using of longperiod levelling measurement on surface of the exploited uranium deposit of Rožná for mathematical modelling of surface ground subsidence
Hortvík, Karel
Negative impact on surface ground with all its implications that result in case of build-up area above deposit worked represents a concomitant effect of almost every mining activity. Therefore, prediction of development of surface ground subsidence caused in this way is very important task when moderating mining damages of undermined landscape.

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