Browsing by Subject "single opening"

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Access status: Open Access ,
Analiza dynamicznego zachowania się belki stropu bezpośredniego będącego w jednoparametrowym kontakcie ze złożem w formie pokładu eksploatowanego na zawał
(Wydawnictwa AGH, 2011) Paluch, Marian; Wosz, Ryszard Józef
In the article was described effect of the works concerning the direct roof strata deflection above the deposit mined by means of the long-wall system with roof destruction in the exploitation conditions of the black coal. A model of the roof has been defined as a brittle rock. The main constitute equations of the model includyt the faktor whith discrabing the dynamic process of mooving direct roof. In calculation long of the cantilever was 10 m, tall 12 m and the third dimension was 1 m.
Access status: Open Access ,
Ugięcie stropu bezpośredniego i zasadniczego nad eksploatowanym pokładem - współczynnik koncentracji naprężenia w obszarze propagującej szczeliny w przekroju zginanej belki stropowej
(Wydawnictwa AGH, 2009) Wosz, Ryszard Józef
This article is a continuation of the research works concerning the immediate and main roof strata deflection above the deposit mined by the chamber-pillar system with roof deflection in exploitation conditions of the copper deposits in LGOM. A model of the roof has been defined as a brittle rock with an unstable crack propagation. The destructive influence of cracks in a brittle material was determined by stresses around an elliptical crack. It has been shown that the maximum stress concentration occurs at the tip of long, narrow opening and the stress concentration factor depends on the shape of opening and its length.