Browsing by Subject "multidimensional compare analysis"

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Access status: Open Access ,
Identyfikacja parametrów wpływających na efektywność drążenia wyrobisk korytarzowych w kopalniach węgla kamiennego
(Wydawnictwa AGH, 2010) Sobczyk, Eugeniusz J.
The work includes an analysis of heading development process in selected Polish hard coal mines. An analysis of average tunnel development face advance and cost was done for 838 headings driven in coal mines in the years 2003-2008. A new methodology for conducting development work efficiency assessments at hard coal mines was proposed. Two structural models of heading development work efficiency were determined: the first one basing on the achieved face advance rates, the second - on the achieved financial results. The results served to formulate aggregate indexes (Wp - aggregate face advance index, We - aggregate cost index), which comprehensively measure the influence natural hazards, deposit parameters and technological parameters have on limiting tunnel face advance rates achieved as well as on development costs. An attempt was made to calculate the optimal heading drivage rate at a minimum cost for each range of the efficiency index We. Average face advance and average face financial results were also described. In analysis a cost structure of heading development with the division into coal, coal-stone and stone face was taken into consideration.