CURSO DE GEOMECÁNICA APLICADA EN MINERÍA SUBTERRÁNEA S UBTERRÁNEA GRAFICA DE ESTABILIDAD DE LAUBSCHER YAMANA GOLD INC. PREPARADO PARA: YAMANA GOLD INC. PREPARADO POR: JULIO DE 2013
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[email protected] 1.0 DIMENSIONAMIENTO DE UNIDADES DE EXPLOTACIÓN E XPLOTACIÓN GRÁFICA DE ESTABILIDAD DE LAUBSCHER: La gráfica de estabilidad de Laubscher, es un método de simple ejecución, el cual entrega información confiable y es una buena herramienta de apoyo. La característica principal de este análisis es que utiliza la cali dad del macizo “Rock Mass Rating” (RMR) de Laubscher,
ponderada por 4 factores de d e ajuste, obteniendo como resultado el “Mining Rock Mass Rating”
(MRMR) el cual se ingresa al grafico de estabilidad, junto con el Radio Hidráulico (RH, área / perímetro) de la cavidad, es posible definir la condición con dición de estabilidad en la cual se encuentra la cavidad en estudio. Ver Figura 1. MINING ROCK MASS RATING (MRMR) DE LAUBSCHER Dado que este método de Laubscher esta basado principalmente en mediciones realizadas en techos de caserones, resulta ser el método mas adecuado a la hora de definir condiciones de
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Considera los efectos de la redistribución de esfuerzos producidos por la excavación. IRS (MPa) PUNTAJE (1-20) ESPACIAMIENTO DE FRACTURAS PUNTAJE (0-25) CONDICION DE FRACTURAS PUNTAJE (10-100%) RMR(0-100)CONDICIONES DE PROYECTO DE UNIDAD DE EXPLOTACIÓN AJUSTESORIENTACIÓN(63-100%)CONDICIÓN DE ESFUERZOS(60120%)TRONADURA(80-100%)METEORIZACIÓN(30-100%)MRMR(0100)DISEÑOESTABILIDADHUNDIBILIDAD%RQD PUNTAJE (0-15) FRECUENCIA DE FRACTURA PUNTAJE (0-40) ORIENTACIÓN DE ESTRUCTURAS FIGURA 1. DIAGRAMA DE FLUJO QUE ILUSTRA EL PROCEDIMIENTYO PARA EVALUAR LOS INDICES RMR Y MRMR.
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CURSO DE GEOMECNICA APLICADA EN MINERA SUBTERRNEA Pág. 3 YAMANA GOLD INC. Calle Limache 3405, Viña del Mar, Chile. Teléfono: (032) 2697 207 –
2697116 –
[email protected]
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Considera la reducción de la calidad del macizo rocoso producto del daño por tronadura. Este factor fluctúa entre un 0.8 y 1.0. c) Factor de ajuste por Meteorización (FM). Ver Tabla 2. Aplicable en aquellos macizos sensibles a los procesos de meteorización. Depende del tiempo y las condiciones atmosféricas a la que se expondrá el macizo una vez generada una excavación. Dada la temporalidad de las construcciones mineras, y la baja o nula interperización que presentan las labores mineras subterráneas, sub terráneas, para este ajuste generalmente gener almente se considera un valor de 1 o 100%. Este factor fluctúa entre un 0.3 y 1.0. TABLA 1. FACTORES DE AJUSTER POR TRONADURA TABLA 2. FACTORES DE AJUSTE POR INTERPERIZACIN
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Este factor fluctúa entre un 0.63 y 1.0. Otra forma de estimar el factor de ajuste por orientación, es a partir de la representación estereográfica de los sistemas de discontinuidades principales y las formas de los bloques que se generan en los techos. A continuación se presentan los factores de ajuste para las diferentes formas de bloques definidos por las discontinuidades. Ver Figura 2. 85%90%RATING EN PORCENTAGE70%75%80%165432,1543256NUMERO DE CARAS DEL BLOQUE INCLINADAS CON RESPECTO A LA VERTICAL3243NUMERO DE ESTRUCTURAS QUE DEFINEN UN BLOQUE342 RATING POR FACTOR DE ORIENTACIÓN 0.95-1.00.85-0.95 1-SISTEMAS SUVBERTICALES2-PURAMENTE DESLIZANTECONDICIÓN ESTRUCTURALREPRESENTACIÓN ESTEREOGRAFICAFORMA DE LOS BLOQUES EN LOS TECHOS DEL CASERÓNCASERNCASERN TABLA 3. FACTORES DE AJUSTE POR ORIENTACIN. FIGURA 2. FACTORES DE AJUSTE POR ORIENTACIN UTILIZADA POR EMT.
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CURSO DE GEOMECNICA APLICADA EN MINERA SUBTERRNEA S UBTERRNEA Pág. 5 YAMANA GOLD INC. Calle Limache 3405, Viña del Mar, Chile. Teléfono: (032) 2697 207 –
2697116 –
[email protected] Para obtener el MRMR se multiplican todos los factores por el RMR, ingresando con este valor al eje de las ordenadas en la gráfica de Laubscher. MRMR = RMR x FE x FO x FT x FM El segundo valor para ingresar a la gráfica (eje de las abscisas) es el Radio Hidráulico del techo a analizar, el cual se calcula de la siguiente forma:
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