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．
马伟斌，张 梅，赵有明，刘艳青，郭小雄，付兵先. 高地应力软岩隧道超前洞室断面优化模拟研究[J]. 铁道工程学报, 2011, 28(9): 58-62.
MA Wei － bin，ZHANG Mei，ZHAO You － ming，LIU Yan － qing，GUO Xiao － xiong，FU Bing － xian. Simulation Study on the Section Optimization of the Super Pilot Tunnel in High Geo － stress Tunnel. 铁道工程学报, 2011, 28(9): 58-62.
Li Xuehua， Yao Qiangling， Zhang Nong． Fracture Characteristics of a Soft Rock Roadway: Staged and Zoned Control ［J］ ． Journal of China University of Mining ＆ Technology，2009( 5) : 618 － 623．
Gao Fuqiang． The Effect of Numerical Simulation Analysis of Cross Section Shapes of Roadways on Surrounding Rock Stability［J］． Journal of Shandong University of Science and Technology: Natural Science， 2007( 2) : 43 － 46．
Dai Yonghao，Chen Weizhong，Liu Quansheng，etc． Optimization Study on Cross Section of Deep Mine Tunnel under High in Situ Stress［J］． Chinese Journal of Rock Mechanics and Engineering，2004( S2) : 4960 － 965．
Ling Biaocan， Huang Xianghong． Three Dimension Numerical Simulation Analysis on the Mechanical Effects o f Roadway Across Shape ［J］ ． Journal of Huainan Institute of Technology，2002( 1) : 6 － 9．
［5］ 李建林． 卸荷岩体力学理论与应用［M］． 北京: 中国建筑工业出版社，1999．
Li Jianlin． Theory and Application of Rock Mass Mechanics under Unloading Conditions［M］． Beijing: China Architecture and Building Press，1999．
Gao Fuqiang． The Effect of Numerical Simulation Analysis of Cross － section Shapes of Roadways on Surrounding Rock Stability ［J］． Journal of Shandong University of Science and Technology: Natural Science， 2007( 2) : 43 － 46．
Su Huayou，Huang Jing，Zhang Jiada． Fuzzy Maths is Applied in Selecting of the Optimal Section form of Road ［J］． Journal of Sichuan Institute Building Materials，1993( 3) : 58 － 62．
Guo Rui， Fang Yong， He Chuan． Study on the Correlation between Stress Release and Displacement Release During Tunnel Excavation ［J］． Journal of Railway Engineering Society，2010( 9) : 46 － 50．
2011, Vol. 28 
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