In hard rock masses, discontinuities control the slope stability, rather than block matrix breakage. The relative position of joints and slope face defines the most likely mechanisms of failure. Among these mechanisms, the wedge failure is one of the most common ways of failure in which joint sets dip and dip direction, slope geometry and direction, external forces (including water pressure and earthquake) and rock and joints mechanical properties control the stability. The determination of these input parameters is not straightforward, mainly due to their variability and the limited amount of information available. Besides, in most projects, input parameters come from different sources (e.g., expert opinion, back-calculation, laboratory tests, field test or different project stages). Therefore, this limited information from different sources should be appropriately incorporated into the stability analysis to assist the design and decision-making process. In this context, random sets arise as a powerful tool to combine different sources of information and to perform a reliability assessment under limited information. This feature makes it possible to update the probability of failure as new evidence is available. With this framework, this paper presents a reliability assessment of wedge stability in a rock slope of a sandstone quarry, located in Une Cundinamarca, where information on mechanical and geometrical parameters has been collected for 20 years.
En este artículo, se evalúa la aplicación de una herramienta de adquisición remota para el muestreo y la medición de propiedades de las discontinuidades en macizos rocosos, basado en la toma e interpretación de imágenes tridimensionales. Metodológicamente, se integra un amplio plan experimental tanto en campo como en laboratorio computacional, para recopilar datos estructurales tales como la orientación, la persistencia y espaciamiento de discontinuidades presentes en un macizo rocoso tomado como caso de estudio. Paralelamente, se llevó a cabo un intenso trabajo de toma de datos en campo por metodologías convencionales de brújula y cinta, con fines comparativos y de validación estadística. Los resultados obtenidos permiten establecer las ventajas del uso de técnicas no convencionales, en términos de calidad y cantidad de información, así como de eficiencia en términos del tiempo requerido para el levantamiento de información en campo. Mediante el análisis semiautomático de imágenes tridimensionales se logró el mapeo geológico y la caracterización de discontinuidades para fines geotécnicos, constituyéndose en una herramienta poderosa con gran potencial de uso en proyectos viales y mineros en el medio colombiano.
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