Browsing by Subject "wyrobiska przygotowawcze"

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Access status: Open Access ,
Geotechniczne problemy utrzymania wyrobisk korytarzowych w złożonych warunkach geologiczno-górniczych
(Wydawnictwa AGH, 2005) Chudek, Mirosław; Duży, Stanisław
The output of useful minerals with underground methods causes the necessity of accomplishing and maintaining excavations in a defined time. These excavations often, when used, are liable to changeable influence of the rock strata mostly caused by the influence of mining works. It has a consequence in the conditions of selective mining exploitation which is an answer to market requisition. The paper presents problems in maintaining excavations localized in a rock strata characterized by i.e.: changing the geological structure along a shift of the analyzed excavations, complicated tectonical structure, complex layout of former exploitation etc., on the example of excavations from chosen collieries. The course of convergence of two roadways in the influence field of an active exploitation front.
Access status: Open Access ,
Zachowanie się odrzwi stalowej obudowy podatnej w warunkach deformacyjnych ciśnień górotworu w świetle obserwacji dołowych
(2007) Duży, Stanisław
In the rock strata deformation pressures occurrence conditions a yielding steel arch support is commonly used. In the commonly used support work models, symmetrical support deformations, caused by a simultaneous dislocation in both arch locks, are adopted. Underground observations have shown that the deformations of even neighbouring arches may differ emphatically in quality as well as in amount. The paper presents results of yielding steel arch support behaviour in headings in mining exploit area, on the basis of which the statement can be made that the yielding steel arch support during the usage of the heading is deformed within the range of the susceptibility and the plastic elements deformations, in some arches the deformations had the factors of stiff support deformations, the support deformations are characterised by asymmetry, often the dislocations occur in only one lock and the deformation process of certain arches along heading coastings show its, which can be compared to a wave process.