Abstract pyT+ba#
Rock mass is inhomogeneous in nature. Data for underground structure designs are mainly obtained from site investigations and S/G,A,"c
tests, but they are very limited. For this reason, uncertainty exists in the process of constructing underground structures in a rock /A9M v%zjk
mass. In the design a tunnel support pattern, the most important parameters such as advance rate and excavation method must be wTf0O@``6H
determined optimally. However, it is difficult to determine these parameters quantitatively. In addition, if these parameters are deter- rPaD#GA[7
mined incorrectly, unexpected risk occurs such as the decrease in the tunnel stability or economic loss due to excessive amount of f `:e#x
supports. +LV'E#h!Q
In this study, a methodology to determine an optimal support pattern and advance rate for the design of a tunnel is introduced -E2[PW4$
based on risk analysis. It can be confirmed quantitatively that the more the tunnel is supported, the higher the reliability index .sbU-_ij@U
becomes and the more stable the tunnel is predicted to be. Also an optimal support pattern and advance rate can be determined xv$^%(Ujp
quantitatively by performing a risk analysis considering the construction cost and the cost of losses that can occur due to the col- #Vs/1y`()
lapse of a tunnel. pnxjuDN7}x
2005 Elsevier Ltd. All rights reserved. Zv 7@
Keywords: Risk analysis; Factor of safety; Monte Carlo simulation; T
