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Analise de subsidencia induzida pela mineracao em macicos rochosos muito fracturados

By Jose Ildefonso Gusmao Dutra

Abstract

The study of strain and displacement mechanisms caused by caving methods of mining in highly fractured rock masses is dealt with in this work. Rock failure leading to fracture under those conditions is also analysed. As the majority of subsidence are developed for coal mines with sub-horizontal seams, considering the deformation of the surrounding rock mass, there is a need to use new methods for the analysis of movements caused by the extraction of sub-vertical seams excavated under roof caving techniques. Due to the multiplicity of intervenient variables in this problem, a versatile and user-friendly numerical model for computer usage was developed. The model is based on the three-dimensional solid flow, by considering the cavities' overlaying rock mass as very much fractured, and applying the superposition principle to the surficial displacements resulting from the propagation of failure phenomena originated by the large amount of caved roofs in the mined area. In terms of mathematical algorithm, the three-dimensional diffusion was utilized by considering the migration of voids from the underground cavities to the ground surface, which seams to simulate adequately the observed phenomena. Model validation was accomplished through its application to the Germunde coal mine, providing a good agreement with the real values of subsidence recorder in the regionAvailable from Fundacao para a Ciencia e a Tecnologia, Servico de Informacao e Documentacao, Av. D. Carlos I, 126, 1200 Lisboa / FCT - Fundação para o Ciência e a TecnologiaSIGLEPTPortuga

Topics: 08E - Geology, mineralogy, sedimentology, SUBSIDENCE, MINING, ROCK MASSES, FRACTURE, COAL MINE, DIFFUSION, VOID MIGRATION, SOLID FLOW, STOPES, ROOF CAVING, FILLING, DRIFT, CROSS-CUT
Year: 1993
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Provided by: OpenGrey Repository
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