...ANALYSIS OF ORE BLOCKAGES IN THE VERTICAL SHAFT AT OPEN PIT MINE BY DISCRETE ELEMENT METHOD *A. Sato and Y. Obara Graduate School of Science and Technology Kumamoto University Kurokami 2-39-1, Chuo-ku, Kumamoto, 860-8555, Japan. (* Corresponding author: E-mail: asato@kumamoto-u.ac.jp) Innovations...

... with the surface traction vector (Cauchy stress) which is an internal force. This fact should be properly taken into account in a numerical analysis of underground structures, particularly for structures such as vertical shafts, tunnels, and caverns constructed at great depths. It is obvious that the gravitational...

...Harmonising Rock Engineering and the Environment Qian & Zhou (eds) © 2012 Taylor & Francis Group, London, ISBN 978-0-415-80444-8 The application of smooth blasting for freezing rock in vertical shaft X.G. Wang China University of Mining and Technology, Beijing, China Jizhong Energy Group Company...

... An investigation was carried out to determine whether a numerical model could be constructed that would produce results that realistically represent actual ground deformations in and around a vertical shaft. The ground deformation was brought about by the partial extraction of the shaft pillar...

... vertical shaft at Beatrix was investigated during 1992 and the purpose was to gain access to the deeper ore reserves situated north of the number one shaft. It also allowed access to available ore reserves in the close proximity to it, previously accessed by means of a service decline, conveyer belt...

... shafts were used as standard means of descret hydro-electric plants, an increased inclination to vertical shafts has been noted during the last few years. This is rather a surfising development considering that alinement of a vertical shaft is approximately 35–40 % longer compandes...

... based on drilling and blasting have been most economical. Vertical shafts 2400 mm in diameter have successfully been drilled with the raise-bore method. Design and construction methods as well as costs for these large unlined openings are presented. RESUME La campagnie petrolière finlandaise...

.... Artificial Intelligence cavern hydraulic fracturing corte fault vertical shaft completion Upstream Oil & Gas bolt system gallery excavation gallery guide layer diameter Muela grid shotcrete shaft Drilling storage project investigation execution underground excavation excavation...

... of shaft pillars in the deep-level mines of South Africa, which exploit narrow, flat-dipping gold-bearing reefs, was suggested by Salamon (1974). According to this method, at depths greater than 2,5 to 3,0 km, protection of vertical shaft systems by shaft pillars becomes prohibitive because of the large...