Browsing by Author "Li, Guo-wei"

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Effects of overburden, rock strength and pillar width on the safety of a three-parallel-hole tunnel
(2009-11-01)
Chen, Shong-loong
;
Li, Guo-wei
;
Gui, Meen-wah
;
土木工程學系
;
Department of Civil Engineering
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.