• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 199
  • 24
  • 17
  • 9
  • 9
  • 9
  • 9
  • 9
  • 9
  • 9
  • 5
  • 3
  • 3
  • 2
  • 2
  • Tagged with
  • 325
  • 325
  • 71
  • 58
  • 45
  • 40
  • 23
  • 20
  • 20
  • 20
  • 17
  • 17
  • 17
  • 15
  • 15
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
171

Élaboration d'une méthode de caractérisation de la dilatance d'une fracture rugueuse en fonction de son déplacement en cisaillement : /

Verreault, Nancy, January 2000 (has links)
Mémoire (M.Sc.T.)--Université du Québec à Chicoutimi, 2000. / Document électronique également accessible en format PDF. CaQCU
172

Validation d'un modèle de comportement mécanique pour les fractures rocheuses en cisaillement /

Flamand, Rock, January 2000 (has links)
Thèse (D.R.M.)--Université du Québec à Montréal, 2000. / Document électronique également accessible en format PDF. CaQCU
173

Cold fluid driven crack propagation thermo-mechanical behaviour of rock caverns /

Derks, Johannes Petrus Bernardus Nicolaas. January 1900 (has links)
Thesis (Doctoral)--Technische Universiteit Delft, 1997. / Includes bibliographical references (p. 149-155).
174

A coupled geomechanics and reservoir flow model on parallel computers

Gai, Xiuli, Wheeler, Mary F. January 2004 (has links) (PDF)
Thesis (Ph. D.)--University of Texas at Austin, 2004. / Supervisor: Mary F. Wheeler. Vita. Includes bibliographical references. Also available from UMI.
175

Numerical simulation of continuous miner rock cutting process

Yu, Bo, January 1900 (has links)
Thesis (Ph. D.)--West Virginia University, 2005 / Title from document title page. Document formatted into pages; contains xiii, 124 p. : ill. (some col.) Includes abstract. Includes bibliographical references (p. 109-112).
176

Cold fluid driven crack propagation thermo-mechanical behaviour of rock caverns /

Derks, Johannes Petrus Bernardus Nicolaas. January 1900 (has links)
Thesis (Doctoral)--Technische Universiteit Delft, 1997. / Includes bibliographical references (p. 149-155).
177

Applied rock cutting : a study of partial face disc cutting with blunt disc cutters /

Schmidt, Stuart. January 2005 (has links) (PDF)
Thesis (Ph.D.) - University of Queensland, 2005. / Includes bibliography.
178

An investigation into the mechanisms of time dependent deformation of hard rocks

Drescher, Karsten. January 2002 (has links)
Thesis (M. Sc.(Mining Engineering))--University of Pretoria, 2002. / Includes bibliographical references (p. 78-81).
179

Use of block theory in tunnel stability analysis /

Choi, Yam-ming, Kelvin. January 2006 (has links)
Thesis (M. Sc.)--University of Hong Kong, 2006.
180

Longwall : estado da arte, geomecânica, planejamento e aplicação

Cardozo, Fernando Alves Cantini January 2015 (has links)
Devido ao esgotamento de jazidas economicamente lavráveis a céu aberto, migrou-se para a lavra subterrânea. Porém, como isso é uma prática antiga, alguns métodos de lavra subterrânea deixaram de ser economicamente viáveis devido ao aprofundamento da lavra. Um exemplo disso é a lavra de carvão no sul do Brasil, onde jazidas exploradas a céu aberto ou mesmo pelo método de Câmaras e Pilares, começam a vislumbrar seu exaurimento técnico de lavra, por altos custos e baixa produtividade, o que norteia a busca por alternativas econômicas mais lucrativas. Uma destas alternativas é o método Longwall, praticamente desconhecido no Brasil, porém com crescente e não nova intenção de implementação no país. Isso já se refletiu em tentativas de operações e em novos estudos conceituais de viabilidade para o estado do Rio Grande do Sul. Estes fatores justificaram este estudo que teve por objetivo lançar luz sobre a lavra de carvão pelo método de Longwall, de modo a respaldar a sua implementação no Brasil. Sendo assim, o método foi descrito com enfoque em seus principais pontos, tais como, geomecânica e planejamento; além de apresentar estudos conceituais de lavra em dois cenários. O primeiro projeto conceitual apresenta um cenário tradicional objetivando implementação no Rio Grande do Sul; o segundo, tem por objetivo apresentar relativa flexibilidade do método, adaptando-o a um cenário não tradicional. Concluiu-se com este trabalho que fatores como geomecânica e correto planejamento de lavra são imprescindíveis para o sucesso da implementação do método. A partir dos resultados do estudo conceitual I e da versatilidade proposta no estudo II se justifica o aprofundamento nos estudos de operações por Longwall no país. / Due to the exhaustion of economically mining deposits, migrated to the underground mining. However, as this is an ancient practice, some underground mining methods are no longer economically viable due to the deepening of the mining. An example of this is the mining of coal in southern Brazil, where deposits exploited opencast or even by the Room and Pillars, begin to envision your fatigue, mining technical high costs and low productivity, which guides the search for more profitable economic alternatives. One of these alternatives is the Longwall method, virtually unknown in Brazil, but with growing and not new intention of implementation in the country. It already was reflected in attempts to operations and on new conceptual studies of feasibility for the state of Rio Grande do Sul. These factors justify this study that aimed to shed light on the mining of coal by Longwall method, in order to support its implementation in Brazil. Therefore, the method has been described with focus on its key points, such as, geomechanics and planning; In addition to presenting conceptual studies of raging in two scenarios. The first conceptual design features a traditional setting with the objective of implementation in the Rio Grande do Sul; the second aims to introduce on the flexibility method, adapting it to a non-traditional setting. This work concluded that factors like geomechanics and correct planning of mining are indispensable for the successful implementation of the method. From the results of the study and conceptual versatility proposal in study II justification the deepening in the studies of Longwall operations in the country.

Page generated in 0.4324 seconds