National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Authentication of real rock mass field voltage to increase safety in anomalous stress states
Koníček, Petr ; Staš, Lubomír ; Ptáček, Jiří ; Kaláb, Tomáš ; Chura, Jan ; Souček, Kamil ; Waclawik, Petr
Voltage fields are one of the key factors that, decisively, along with the mechanical and remodeling properties of rocks, greatly influence the behavior of the mountain massif. Knowledge of stress fields is beneficial for the design and successful implementation of geotechnical underground projects (eg for the assessment of the stability of underground spaces, the behavior of proposed reinforcements of underground structures, for space-time placement of underground structures) especially in non-trivial geomechanical conditions, both in terms of natural factors affecting stress fields structural and geological structure of the rock mass, tectonic stress, cracks and discontinuity in the rock mass) as well as anthropogenic factors (geomechanical configuration of the underground spaces and dynamics of their changes). Geotechnical practice in our (Czech) conditions is usually used only calculations of a voltage field based primarily on the theoretical behavior of the rocks and the assumed vertical geostatic pressure at a given depth. The development of possible progressive deformations of the stress field is then derived from the development of anthropogenic interventions into a relatively homogeneous massif. In fact, tension is also affected by close geological structures. The data obtained from the study of the magnitude, direction and change of stress in the mountain massif are a significant contribution in mathematical modeling where they can be used as input parameters to obtain a more accurate picture of the behavior of mountain massifs and underground structures in the subject areas.
Vypracování jednotného metodického postupu pro dimenzování výztuže důlních chodeb a prorážek
Šňupárek, Richard ; Ptáček, Jiří ; Chura, Jan ; Koníček, Petr ; Konečný, Petr ; Janas, P. ; Polysos, N. ; Nastulczyk, Č. ; Suchánek, J.
Výsledkem řešení projektu je soubor metodických návodů a výpočetních programů pro dimenzování výztuže důlních chodeb a prorážek v podmínkách OKD a.s. Objednatel má k dispozici prostředky pro bezpečné a racionální dimenzování výztuže chodeb v rozhodující většině podmínek OKD a.s.

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