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Abstract
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Article Information:
Eleveted Stress Regime within Birimian Metallurgenic Province of Ghana-Implications to Deep Level Mining
M. Affam, J. Archibald and C.F.A. Akayuli
Corresponding Author: Michael Affam
Submitted: 2011 April, 10
Accepted: 2011 July, 02
Published: 2011 August, 30 |
Abstract:
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This study aims at evaluating the likely effect of high stress regime within the rocks of the Birimian Supergroup of Ghana, dated middle Precambrian and offer remediation strategies. The stress levels were
therefore assessed between 26-level to 50-levels (i.e., 755 to 1500 m deep) within the deepest mine in the
formation. Results indicated that pre-and-post mining stresses levels were 75 and 200 MPa, respectively. These
levels are quite high and could induce stress related instabilities. Fundamental studies of failure behaviour of
the rockmass show that elevated stress regime of this kind poses great potential for eminent rock bursting within
the Birimian. Such situations demand concerted efforts of strategic mine design measures, including modified
excavation geometry and destressing or preconditioning. These methods could be exploited to extend the
normal zone of stress induced fractured rock to a greater depth ahead of the excavation face. Support could be
improved further by adopting higher rockbolting density or tougher mesh together with shortcrete. If the
excavation becomes prone to moderate rockbursting, provision of appropriate support structure can also be
made either to limit the bulking process or reduce excessive rock deformation.
Key words: Birimian supergroup, elevated stress, graphitic shear, monitoring, rockburst, support unit,
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Cite this Reference:
M. Affam, J. Archibald and C.F.A. Akayuli, . Eleveted Stress Regime within Birimian Metallurgenic Province of Ghana-Implications to Deep Level Mining. Research Journal of Applied Sciences, Engineering and Technology, (08): 713-719.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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