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Journal of Zhejiang University SCIENCE A 2009 Vol.10 No.11 P.1581~1588

10.1631/jzus.A0920040


Effects of overburden, rock strength and pillar width on the safety of a three-parallel-hole tunnel


Author(s):  Shong-loong CHEN, Guo-wei LI, Meen-wah GUI

Affiliation(s):  Department of Civil Engineering, National Taipei University of Technology, Taipei; more

Corresponding email(s):   mwgui@ntut.edu.tw

Key Words:  Three-parallel-hole tunnel, Tunnels interaction, Rock pillar, Numerical analysis, Stress strength ratio (SSR)


Shong-loong CHEN, Guo-wei LI, Meen-wah GUI. Effects of overburden, rock strength and pillar width on the safety of a three-parallel-hole tunnel[J]. Journal of Zhejiang University Science A, 2009, 10(11): 1581~1588.

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author="Shong-loong CHEN, Guo-wei LI, Meen-wah GUI",
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publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A0920040"
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%T Effects of overburden, rock strength and pillar width on the safety of a three-parallel-hole tunnel
%A Shong-loong CHEN
%A Guo-wei LI
%A Meen-wah GUI
%J Journal of Zhejiang University SCIENCE A
%V 10
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%@ 1673-565X
%D 2009
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A0920040

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T1 - Effects of overburden, rock strength and pillar width on the safety of a three-parallel-hole tunnel
A1 - Shong-loong CHEN
A1 - Guo-wei LI
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J0 - Journal of Zhejiang University Science A
VL - 10
IS - 11
SP - 1581
EP - 1588
%@ 1673-565X
Y1 - 2009
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A0920040


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.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

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[3] Chen, S.L., Lee, S.C., Gui, M.W., 2009. Effects of rock pillar width on the excavation behavior of parallel tunnels. Tunnelling and Underground Space Technology, 24(2):148-154.

[4] Georgiadis, K., Potts, D.M., Zdravkovic, L., 2004. Modelling the shear strength of soils in the general stress space. Computers and Geotechnics, 31(5):357-364.

[5] Hakala, M., Tolppanen, P., 2003. Analyses of Tunnel Stress Failures at Pyhäsalmi Mine. ISRM–Technology Roadmap for Rock Mechanics, South African Institute of Mining and Metallurgy, p.461-464.

[6] Hoek, E., Brown, E.T., 1997. Practical estimates of rock mass strength. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts, 34(8):1165-1186.

[7] Kuang, P.S., Wang, W.L., 1993. Practical application of FLAC in tunnel engineering. Sino-Geotechnics, 41:53-54 (in Chinese).

[8] Shrestha, G.L., 2005. Stress Induced Problems in Himalayan Tunnels with Special Reference to Squeezing. PhD Thesis, Norwegian University of Science and Technology, Norway, p.203.

[9] TANEEB (Taiwan Area National Expressway Engineering Bureau), 1991. Basic Design of Taipei-Ilan Expressway Project. Final Report of Geological Investigations for Pinlin-Touchen Section (in Chinese).

[10] Wang, W.L., 1993. Practical application of FLAC in tunnel engineering. Sino-Geotechnics, 41:53-54 (in Chinese).

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