Repository logo

Browsing by Subject "loading capacity"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Problemy nośności stalowej obudowy odrzwiowej wyrobisk korytarzowych użytkowanych w długim okresie
    (2007) Chudek, Mirosław; Duży, Stanisław; Dyduch, Grzegorz; Bączek, Arkadiusz
    Over 90 percent of headings in collieries are made with steel support. This support is often under intensive, aggressive influence of mining conditions causing a slow decrease of construction load capacity. The paper presents results of in situ research of corrosion of steel support set ŁP, on the basis of headings steel supports set, used in a long period of time, reliability maintenance geomechanical and technical problems. On the basis of the results of the research, the characteristic features of the corrosion process and their influences of the construction load capacity are presented.
  • thumbnail.journal.alt
    Item type:Article, 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.