Underground Excavations
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Estimating extent and properties of blast-damaged zone around underground excavations
Abstract A common technique in hard rock tunneling, and underground excavation in general, is drilling and blasting. This method of excavation assumes that damage will be done to the surrounding rock mass depending on its quality. Herein is a proposal for how to estimate blast-damaged zone extent and shape, and how to quantify rock mass properties in this zo
Rem: Rev. Esc. Minas. Publicado em: 2015-12
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2. Aspectos sócio-econômico-ambiental do processo de extração do caulim no município de Junco do Seridó-PB
The paper entitled "Socio-Economic and Environmental Process Extraction of Kaolin in the Municipality of Junco do Seridó/PB" is a guided study on the extraction of kaolin in the municipality of Junco do Seridó/PB, which is the largest production center of this mineral in the state Paraíba. This activity is the basis of an extensive and complex supply chai
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/11/2011
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3. Methodology for the interpretation of the control of underground excavations. / Metodologia para a interpretação do monitoramento de escavações subterrâneas.
This thesis studies prediction, occurrence and monitoring of movements in rock and soil masses in underground excavations, it is emphasized that the study bases fundamentally on monitoring. A technical methodology is proposed for analysis and interpretation of time series from geotechnical instrumentation measurements, based on geomechanical criteria and cla
Publicado em: 2007
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4. Perfil geológico-geotécnico do subsolo ao longo do traçado do metrô de Goiânia / Geological-geotechnical profile of the subsoil along the Goiânia suway alignment
The building of the Goiânia subway is one of the items in the Proposal for Life Quality Improvement and Social Inclusion of the population of the Metropolitan Region of Goiânia (MRG), involving the municipal administrations of Goiânia and Aparecida de Goiânia. The proposal, which is part of the rearrangement of the MRG public transport system and follows
Publicado em: 2007
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5. Estudo do fluxo de material fragmentado na mineração subterrânea, com o uso de modelos físicos
The main objective of this work was the study of gravity flow in excavations, mainly ore passes, in underground mining, by use of physical models. At review of literature it is presented terminology, flow properties of bulk materials, laws of gravity flow, flow design, flow patterns, flow phenomena, such as arching and rat holing, issues of security at work
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/02/2005
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6. Time-dependent behavior of sulphatic rocks of the anhydrite and gypsum / Comportamento dependente do tempo de rochas sulfáticas de anidrita e gipso
The purpose of this thesis is to contribute for the knowledge of time-dependent behavior of sulfatic rocks of anhydrite and gypsum. Emphasis is given to provide straightforward arguments about physical mechanisms responsible for creep observed in some underground excavations in those rocks in Europe. Explanation for this phenomena is not clear yet and studie
Publicado em: 2005
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7. THERMODYNAMIC NONEXTENSIVITY, DISCRETE SCALE INVARIANCE AND ELASTOPLASTICITY: A STUDY OF A SELF-ORGANIZED CRITICAL GEOMECHANICAL NUMERICAL MODEL / NÃO-EXTENSIVIDADE TERMODINÂMICA, INVARIÂNCIA DISCRETA DE ESCALA E ELASTO-PLASTICIDADE: ESTUDO NUMÉRICO DE UM MODELO GEOMECÂNICO AUTO-ORGANIZADO CRITICAMENTE
This thesis aims at applying new concepts from solid state physics and statistical mechanics - chaos theory and fractal geometry - to the study of nonlinear dynamic systems. More precisely, it deals with a two-dimensional continuum elastoplastic Mohr-Coulomb model, commonly used to simulate pressure-sensitive materials (e.g., soils, rocks and concrete) subje
Publicado em: 2003
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8. Simulação numerica do comportamento mecanico do sal em poços de petroleo
Drilling incidents such as stuck pipe and collapsed casing string take place when some type of salt formations are drilled because of the high pronounced plastic behavior of the salt and the creep behavior as a function of time of this type of rock. The creep behavior becomes faster and more severe if temperature and/or pressure acting on the salt go up. The
Publicado em: 1997