Abstract
The mining industry relies heavily on the use of empirical charts for entry-type excavation design and assessment of stability. The commonly used empirical design method, called the critical span graph based on an extensive case history database of cut and fill mining operations in Canada, was specifically developed for rock stability analysis in entry-type excavations. This span design chart plots the critical span against rock mass rating for the observed case histories and has been widely accepted by many mining operations for an initial span design of cut and fill stopes.
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Zhang, W. (2020). MARS Use in Evaluating Entry-Type Excavation Stability. In: MARS Applications in Geotechnical Engineering Systems. Springer, Singapore. https://doi.org/10.1007/978-981-13-7422-7_13
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DOI: https://doi.org/10.1007/978-981-13-7422-7_13
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