Implementation of a Flaw Model to the Fracturing Around a Vertical Shaft |
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| Authors: | B Van de Steen A Vervoort J A L Napier R J Durrheim |
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| Institution: | (1) Department of Civil Engineering, Katholieke Universiteit Leuven, Belgium, BE;(2) CSIR Miningtek, Johannesburg, South Africa, ZA |
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| Abstract: | Summary This paper investigates whether a micromechanical model developed to investigate the relation between the basic failure processes
at grain-scale and the macroscopic failure pattern can be applied to model the fracturing around large-scale excavations.
The simulated fracture pattern around a vertical shaft is compared to the fracturing around a shaft at a depth of 3400 m.
The simulations suggest that wedge-shaped zones, called dog-ears, are formed by a progressive splitting-like failure of the
rock. The fractures forming these slabs nucleate in the zones subjected to the highest compressive stresses. Both shear and
tensile mechanisms are responsible for the fracturing. The dog-ears deepen and widen as spalling continues.
Received June 5, 2001; accepted September 24, 2002; Published online January 21, 2003
Acknowledgements The simulations presented in this paper form part of the PhD study of B. Van de Steen at the KULeuven. The authors wish to
thank the sponsors of the Deepmine project for the permission to use the information pertaining to the fracturing around the
South shaft at Western Deep Levels.
Authors' address: André Vervoort, Katholieke Universiteit Leuven, Faculty of Engineering, Department of Civil Engineering, Kasteelpark Arenberg
40, B-3001 Leuven, Belgium; e-mail: andre.vervoort@bwk.kuleuven.ac.be |
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| Keywords: | : Fracture mechanics instability numerical simulation shaft excavation boundary elements |
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