Caracterización geológico-geotécnica de la Mina de Carbón Isaac Osvaldo Alarcón Garrido (IOAG) en Curanilahue, Región del Bío Bío, Chile
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Fecha
2020
Profesor/a Guía
Facultad/escuela
Idioma
es
Título de la revista
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Título del volumen
Editor
Universidad Andrés Bello
Nombre de Curso
Licencia CC
Licencia CC
Resumen
En este trabajo se presentan los resultados de un estudio de geológico-geotécnico del área
de reservas de la mina subterránea de carbón Isaac Osvaldo Alarcón Garrido, ubicada
dentro de la cuenca sedimentaria de Arauco específicamente en la comuna de Curanilahue
VIII región del Biobío, Chile. Las secuencias sedimentarias se presentes en la mina
pertenecen la formación Curanilahue y formación Boca Lebu y se disponen como un
potente bloque sedimentario limitado por la falla Carrera y Chulita ambas de dirección NNESSW con saltos de 160 y 200, metros respectivamente. La información obtenida para
estudio proviene de la testificación de 23 sondajes en conjunto con la medición de datos en
diferentes sectores de las galerías de explotación de la mina, en base a estos datos se
definieron unidades litológicas, geología estructural, clasificaciones geomecánicas RMR –
GSI, unidades lito-geotécnicas y análisis de cuñas. Los resultados indican que existen dos
unidades lito-geotécnicas de calidad de roca contrastante, la unidad lito geotécnica I
presenta calidad de roca RMR buena a regular y se compone de areniscas finas verdosas
– grises y areniscas conglomeráticas, la unidad lito geotécnica II presenta calidad de roca
RMR mala y se compone de limolitas masivas y carbonosas en conjunto con 2 mantos de
carbón. El análisis de cuñas establece que existe la formación de cuñas laterales basales
y superiores para los túneles en estudio sin embargo estas presentan valores de factor de
seguridad elevados.
This work presents the results of a geological-geotechnical study of the reserve area of the Isaac Osvaldo Alarcón Garrido underground coal mine, located within the Arauco sedimentary basin specifically in Curanilahue, VIII region of Biobío, Chile. The sedimentary secuences of the mine belong to Curanilahue and Boca Lebu formation they are disposed like a potente sedimentary block limited by the Carrera and Chulita fault, both with NNESSW direction and 200 - 160 meters of leap respectively. The information obtained for the study comes from the testimony of 23 drillholes together with the measurement of data in different sectors of the mine's exploitation galleries. Based on these data it was determinated a geological units, estrctural geology, geomechanical classifications RMR – GSI, lithogeotechnical units and wedge analysis. The results indicate that there are two contrasting rock quality litho-geotechnical units, the litho-geotechnical unit I presents good to regular RMR rock quality and is composed of greenish fine sandstones, grayish fine sandstones and conglomeratic sandstones. The litho-geotechnical unit II presents bad RMR rock quality and is composed of siltstone, carbonaceous siltstone and two coal seam. The wedge analysis establishes that there is the formation of basal and upper lateral wedges for the tunnels under study, however these have high safety factor values.
This work presents the results of a geological-geotechnical study of the reserve area of the Isaac Osvaldo Alarcón Garrido underground coal mine, located within the Arauco sedimentary basin specifically in Curanilahue, VIII region of Biobío, Chile. The sedimentary secuences of the mine belong to Curanilahue and Boca Lebu formation they are disposed like a potente sedimentary block limited by the Carrera and Chulita fault, both with NNESSW direction and 200 - 160 meters of leap respectively. The information obtained for the study comes from the testimony of 23 drillholes together with the measurement of data in different sectors of the mine's exploitation galleries. Based on these data it was determinated a geological units, estrctural geology, geomechanical classifications RMR – GSI, lithogeotechnical units and wedge analysis. The results indicate that there are two contrasting rock quality litho-geotechnical units, the litho-geotechnical unit I presents good to regular RMR rock quality and is composed of greenish fine sandstones, grayish fine sandstones and conglomeratic sandstones. The litho-geotechnical unit II presents bad RMR rock quality and is composed of siltstone, carbonaceous siltstone and two coal seam. The wedge analysis establishes that there is the formation of basal and upper lateral wedges for the tunnels under study, however these have high safety factor values.
Notas
Tesis (Geólogo)
Palabras clave
Minas de Carbón, Geología de Minas, Chile, Curanilahue