Stability Assessment of a Drivage in Jointed Rock Mass Using the Three Dimension Discrete Element MethodPages 38-47
Abstract:
To run an underground mine effectively and safely, it is important to have a good understanding of the geotechnical behaviour around the underground excavations made in the mine. The stability of an underground drivage is influenced by many factors, primarily the in-situ stress, depth of drivage, orientation of discontinuities, intensity of jointing, groundwater, rock mass quality, shape and size of the drivage etc. This study is a continuation of stability analyses and support design of drivage, based on numerical methods. Generally rock bolt type support is used in underground excavation, to provide stability of the excavation. Using the information available on lithology, the orientation of discontinuities, in situ stress measurements, physical and mechanical properties of intact rock, discontinuities and, a three-dimensional numerical model was built by using the 3DEC software package to simulate a drivage excavation under in-situ stress condition. Numerical results have revealed that the total volume of failed blocks has reduced to 81.01%, 87.73%, 92.09%in case of 3 bolt support,4 bolt support,5 bolt support system with compare to no support system respectively. The greatest limitation in numerical modelling is the reliability of the input parameters. Hence, a parameter study on rock properties and field stress to be carried out properly.
Keywords: Drivage, 3DEC, Support Density, Failed Rock, Excavation
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