Title: Effects of overburden, rock strength and pillar width on the safety of a three-parallel-hole tunnel
Authors: Chen, Shong-loong
Li, Guo-wei
Gui, Meen-wah
Department of Civil Engineering
Keywords: Three-parallel-hole tunnel;Tunnels interaction;Rock pillar;Numerical analysis;Stress strength ratio (SSR)
Issue Date: 1-Nov-2009
Abstract: During the excavation of three-parallel-hole tunnel, the tunnel might collapse due to over-stress as a result of inadequate rock pillar width. Treating the rock overburden depth, rock strength, and rock pillar width as variables, a series of 3D numerical analysis was carried out to examine the effect of each variable on the safety of the tunnel, in particular the rock pillar. A stress strength ratio (SSR) was used to define whether the safety of the rock pillar was exceeded. A simple design chart for the case of three-parallel-hole tunnel, which took into account the influence of overburden depth, rock pillar width, and rock strength, was also proposed for used in the preliminary design stage.
URI: http://dx.doi.org/10.1631/jzus.A0920040
ISSN: 1673-565X
DOI: 10.1631/jzus.A0920040
Volume: 10
Issue: 11
Begin Page: 1581
End Page: 1588
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