Stability under Seepage Flow Conditions of a Tunnel Face Reinforced by Bolts
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Author / Producer
Date
2017
Publication Type
Conference Paper
ETH Bibliography
yes
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Abstract
We propose a computational method for assessing bolt reinforcement of the tunnel face in cohesive frictional soils and weak rocks under seepage flow conditions. The method is based on limit equilibrium factors and can be applied to reinforcement layouts that are arbitrary in terms of the spacing, length, longitudinal overlapping and installation sequence of the bolts.
An investigation is made into the influence of water table height on the stability of a reinforced face. In particular, we show that, if the gradient of the hydraulic head is high, then tensile failure of the ground ahead of the face may be more critical than shear failure. For an approximate hydraulic head distribution in the ground around the tunnel face and assuming uniform face reinforcement, we derive a closed-form solution for the necessary bolting density.
Permanent link
Publication status
published
External links
Book title
ISRM European Rock Mechanics Symposium EUROCK 2017
Journal / series
Volume
191
Pages / Article No.
215 - 224
Publisher
Elsevier
Event
ISRM European Rock Mechanics Symposium (EUROCK 2017)
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
tunnel face stability; limit equilibrium; face bolts; drained conditions; seepage forces
Organisational unit
03655 - Anagnostou, Georgios (emeritus) / Anagnostou, Georgios (emeritus)
02607 - Institut für Geotechnik / Institute for Geotechnical Engineering