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| Characteristcs and Prediction of Geological Disaster of High Gas Mountain Tunnel |
| LIU Yang1，YAO Hai － bo2 |
| 1． The Fifth Engineering Co． Ltd，China Railway Tunnel Group Co． Ltd，Beijing 100022，China; 2． China Jingye Engineering and Technology Company Ltd，Beijing 100088，China |
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Abstract Research purposes: It is very dangerous to excavate the tunnel in oil and gas area． As the bottom tunnel rock is located in the gas － oil layer，there exists abundant gas around the bottom tunnel rock mass． If the fault and joint zones exist，the gas would leak out． So it is vital to detect the position，nature，size and state of fault and joint zones in gas －oil layer to identify whether it would become a gas passage or not so as to take steps in time to guarantee the safety of tunnelling．
Research conclusions: ( 1) For the tunnel in oil and gas area，we should understand the characteristics of gas on the basis of area geology analysis． In that case，we can recognize the essence of gas flooding，master the mechanism of disaster coming and set down the prediction scheme． ( 2) Accurate geology analysis can establish the stable basis for TSP detection． ( 3) The operation in scene is strict． The detection and drilling construction are the necessary conditions for coming true the accurate prediction． ( 4) Combing the geology and geophysics is the basis of successful detection．
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Received: 20 January 2011
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［1］ 廖义沙，徐国盛，王威． 洛带气田中侏罗统沙溪庙组高产气井主控因素分析［J］． 物探化探计算技术，2008 ( 1) :47 － 51．
Liao Yisha，Xu Guosheng，Wang Wei． Analysis on Main Control Factors of High Produdct Gas Well in Shaximiao Formation of Middle Jurassic Stratum in Luodai Gas Area ［J］． Calculation Technology of Physical and Chemical Detection，2008( 1) : 47 － 51．
［2］ 杨凯歌，何志国． 成都洛带上沙溪庙组气藏地层水分布特征研究［J］． 四川地质学报，2008( 3) : 102 － 107． Yang Kaige，He Zhiguo． Research on Distribution Characteristics of Stratum Water Exists in Upper Shaximiao Formation in Luodai Gas Field［J］． Sichuan Geology Transaction，2008( 3) : 102 － 107．
［3］ 刘殊，颜琰，袁红卫． 川西凹陷浅层气藏分布规律研究———以洛带和新场气田为例［J］． 石油物探，2006( 4) : 12 － 18．
Liu Zhu，Yan Yan，Yuan Hongwei． Research on Distribution Law of Shallow Gas Mine in West Sichuan －Taking Luodai and Xinchang Gas Field as Examples ［J］． Oil Physical Exploration，2006( 4) : 12 － 18．
［4］ 罗啸泉，张箭，卜淘川． 西坳陷洛带地区遂宁组气藏成藏模式［J］． 天然气工业，2007( 3) : 254 － 259． Luo Xiaoquan，Zhang Jiang，Bu Taochuan． Formation Model of Gas Mine in Suining Stratum in West Luodai District［J］． Gas Industry，2007( 3) : 254 － 259．
［5］ 陈元元，李法昶． 非煤气地层瓦斯溢出的启示［J］． 铁道工程学报，2010( 2) : 66 － 70．
Chen Yuanyuan， Li Fachang． Thoughts on Gas Overflow from the Non － gas Stratum［J］． Journal of Railway Engineering Society，2010( 2) : 66 － 70．
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2011, Vol. 28 
