Abstract +Hb6j02 #
Rock mass is inhomogeneous in nature. Data for underground structure designs are mainly obtained from site investigations and ~QsQ7SAs
tests, but they are very limited. For this reason, uncertainty exists in the process of constructing underground structures in a rock ::vw 1Es
mass. In the design a tunnel support pattern, the most important parameters such as advance rate and excavation method must be 4[!&L:tR
determined optimally. However, it is difficult to determine these parameters quantitatively. In addition, if these parameters are deter- x./jTebeO
mined incorrectly, unexpected risk occurs such as the decrease in the tunnel stability or economic loss due to excessive amount of ma
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supports. -7" >A~c
In this study, a methodology to determine an optimal support pattern and advance rate for the design of a tunnel is introduced .6 E7 R
based on risk analysis. It can be confirmed quantitatively that the more the tunnel is supported, the higher the reliability index + +13m* fA
becomes and the more stable the tunnel is predicted to be. Also an optimal support pattern and advance rate can be determined ':!; 6v|L
quantitatively by performing a risk analysis considering the construction cost and the cost of losses that can occur due to the col- K (plzQ3
lapse of a tunnel. 7OOB6[.fu
2005 Elsevier Ltd. All rights reserved. 3RRZVc*
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Keywords: Risk analysis; Factor of safety; Monte Carlo simulation; T
