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Lookup NU author(s): Dr Colin Davie
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Numerical studies of a generic arched-roof profile tunnel was carried out in order to investigate the influence of geometric size on stress distribution and deformation in rockmass surrounding tunnels which can be optimized in design and construction of underground works. Results show that increasing the aspect ratio of the arched-roof tunnel will cause corresponding increase in the magnitude and size of zone of adverse compressive stress concentration at the tunnel sidewall while the extent of de-stressing zone at the invert/crown decreased. The converse is true for increasing span to height ratio. Similarly, the horizontal displacement of rock mass in the vicinity of the tunnel sidewall shows an increasing trend with increasing aspect ratio of the tunnel. In contrast, the tunnel seems not to experience significant variation in vertical displacement of the floor and roof at increasing aspect ratio. These observed trends in variations of the phenomena of stress re-distribution and deformation in rocks surrounding tunnels with tunnel dimensions demonstrate that stress induced instabilities can be effectively regulated by adopting appropriate dimensions relative to rockmass properties and engineering objective.
Author(s): Ene GE, Davie CT, Okogbue CO
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: XII International IAEG Congress
Year of Conference: 2015
Library holdings: Search Newcastle University Library for this item
Series Title: Engineering Geology for Society and Territory - Volume 6: Applied Geology for Major Engineering Projects