Search

Start Over Subject doly Date Unknown

41. Hornické aktivity firmy Baťa a.s. Zlín a možnosti jejich využití v současném cestovním ruchu /

Creator:
Stefanovová, Zuzana,
Type:
studie
Subject:
Hornictví, Baťa, Tomáš,, doly, těžba lignitu, kanály vodní, památky technické, Československo 1918-1938, průmysl, manufaktury, hornictví, pivovary, and jednotlivé památky, památkové rezervace
Language:
Czech
Description:
The Mining Activities of the Baťa Joint Stock Company, Zlín, and Possibilities of their Exploitation in Today's Tourism Industry.
Rights:
unknown

48. Influence of dislocations on bumps occurrence in deep mines

Creator:
Petr Procházka, Jiřina Trčková, and Lok, Tat Seng
Format:
print, bez média, and svazek
Type:
article, články, model:article, and TEXT
Subject:
Geologie. Meteorologie. Klimatologie, numerické modelování, doly, numerical modeling, mines, free hexagon method, deep mines, bumps occurrence, 7, and 551
Language:
English
Description:
The problem of bumps occurrence in deep mines during the long wall mining appears to be one of the most serious one in the design of engineering of mining. The bumps are caused for various reasons, but basically it is an aftermath of the accumulated energy, which is released under some unfavorable conditions. In this paper the influence of given dislocations and their slope in a coal seam are studied based. The numerical tool is the free hexagon method. This method belongs to a set of discrete element methods and enables us to define and calculate stresses in a natural way along the interfacial boundaries of adjacent particles (elements). Since the bumps are affected by a possible slip along the dislocations, dynamical response has to be taken into account. The velocity of excavation of the mine is considered by successive change of values of Eshelby’s forces on the face of the wall., Petr Pavel Procházka, Jiřina Trčková and Tat Seng Lok., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public