Extinguishing the underground coal gasification georeactor in the bituminous coal mine Wygaszanie georeaktora podziemnego zgazowania węgla w kopalni węgla kamiennego

Archives of Mining Sciences

“…The steel arch support (passive) sustains the weight of the rocks in the fractured zone around the working (Cała et al, 2001), whereas the rockbolting support system (active) reinforces the natural self-supporting capacity of the rock mass surrounding the working. Yielding steel arch support (Jacobi, 1981;Majcherczyk et al, 2014;Podjadtke et al, 2008;Turek, 2010;Turek et al, 2015) and yielding rockbolting support systems (Cała et al, 2001;Sun et al, 2018) are commonly used in difficult geological and mining conditions. These conditions are related to the occurrence of significant static and dynamic loads, which are accompanied by major rock mass deformations, and are also associated with high rock mass stress (Ptáček et al, 2017).…”

“…A similar situation occurs during longwall extraction (Nierobisz, 2006), where large steel arch support systems require additional reinforcement. Rockbolting of the support frame increases its load capacity (Turek, 2010(Turek, , 2012Turek et al, 2015), which also makes it possible to increase its spacing and to limit the number of utilised reinforcement elements, i.e. props and joists, that limit the throughput of the working.…”

“…Recent data from Polish hard coal mines indicates (Turek et al, 2015) that in 2012 mixed support systems were the most commonly employed type of gallery working support systems utilising rock bolts. The mixed support consists of yielding steel arch or straight frame sets combined with rock bolts (e.g.…”

“…Due to the different nature of the interaction of the yielding steel arch support and the rock bolts with the rock mass (Turek, 2010), and due to the complexity of this interaction (Cała et al, 2001), an attempt was made at the Central Mining Institute to compare the courses of the support load F as a function of the support height reduction ΔH. This article presents the results of comparative bench tests of the ŁP10/V36-type steel arch support, tested with and without reinforcement by means of self-drilling bolts with external drunken R25 threads (ISO 10208:1991).…”

Identyfikacja czynników wpływających na wielkość produkcji w kopalniach węgla kamiennego

“…The thickness of the seam under certain conditions, e.g. in the absence of geological disturbances, sufficiently strong roof rocks and the possibility of using mechanized support of sufficient height can be equated with the height of the longwall (Turek 2007).…”