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| Simulation Study on the Section Optimization of the Super Pilot Tunnel in High Geo － stress Tunnel |
| MA Wei － bin1，ZHANG Mei2，ZHAO You － ming1，LIU Yan － qing1，GUO Xiao － xiong1，FU Bing － xian1 |
| 1． China Academy of Railway Sciences，Beijing 100081，China; 2． The Engineering Management Center of Ministry of Railways，Beijing 100844，China |
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Abstract Research purposes: In order to solve the problem of the large deformation in high geo － stress tunnel of ongoing lanzhou － chongqing railway，according to the characteristic of the complex geological conditions and changeable influencing factors，the high in － situ stress in the right hole was released in advance by using deformability of the super pilot tunnel，under these conditions，the right hole was in acceptable low － stress state when it was excavated，which was potengoally less the input of support rigidity． This paper determined reasonable by using numerical simulation method．
Research conclusions: By taking maoyushan tunnel as the research object，the displacement release rate corresponding various location and dimension of the super pilot tunnel was studied in the paper through numeric simulation． The two －dimensional analysis show that the reasonable dimension of the super pilot tunnel was 7． 6m( width) × 5． 5m( height) ．The reasonable distance between the pilot tunnel vault and the right holr vault was 2． 5m． The displacement release rate fo A snd BB `and CC `and DD `were respevtively 37% ，54% ，72% and 59% ． This paper can provide reference for construction and design of other similar projects．
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Received: 26 May 2011
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2011, Vol. 28 
