梁立刚，林兴贵，骆汉宾

摘要:为解决盾构隧道穿越沼气地层时由于沼气处理不当而发生安全事故，本文提出了盾构隧道穿越沼气地层的“事前、事中和事后 ”三层风险识别与控制体系。探讨了地质勘探中沼气来源与风险识别流程，进而通过分析盾构机的掘进速度、出土量与地层中赋存沼气的相互关系，确立了判定沼气等级的计算公式。建立了沼气监测系统，系统地论述了沼气隧道施工中对于施工技术等方面的要求与实现路径。制订了详细的应急预案响应机制以保证盾构施工的安全。以武汉地铁 2 号线汉 —范区间为例，验证了该技术体系的应用效果。结果表明，该技术体系能够对盾构沼气地层进行有效的风险识别与控制，并帮助改进施工技术方案，保证了该盾构隧道零安全事故的顺利贯通，为后续类似沼气地层的盾构施工提供了重要借鉴。

关键词:盾构; 沼气地层; 风险识别; 实时监测; 风险控制

Researchfor on Identification and Control Technology Shield Tunnel crossing

LIANG Li-gang, LINXing-gui, LUO Han-bin

Abstract: In order to preventsafety accidents in shield tunnel crossing biogas layer according to improperhandling of biogas } the risk identification and control technology for shieldtunnel crossing biogas layer is established，which consists of three layers: pro-controlin-control and ex-control. Firstly it discussed the risk identification processand criteria of geological exploration in shield tunnel.Then，the formulas for determiningbiogas level is established for providing a quantitative criterion of riskcontrol level of biogas which is due to analyze the interrelation of the speedof shield tunneling machine，the amount ofunearthed and the concentration of biogas in formation. Secondly a gasmonitoring system in line with the actual needs is established andsystematically discussed the requirements and implementation path ofventilation，constructiontechnology, et al. In biogas-tunnel construction. At the same time，a detailed contingency plan isdeveloped to ensure the safety of shield construction.  Finally，itillustrated the effect of the technology in Han}'an interval of Wuhan Metro Line2. The results show that the technology can effectively/identify monitor andimprove the construction program，ensured the shieldtunnel passed through without any security incidents. It provides an importantreference for the subsequent shield construction projects crossing biogaslayer.

Keywords:shieldtunnel;biogas layer;risk identification;real time monitoring;risk controlling

下载地址：

http://www.cnki.net/KCMS/detail/detail.aspx?QueryID=81&CurRec=1&recid=&filename=WHCJ201501012&dbname=CJFDLAST2015&dbcode=CJFQ&pr=&urlid=&yx=&uid=WEEvREcwSlJHSldTTGJhYlNlOUxRWjI4aVF4ck5nSmoxMDkyTHFyWnJhZlF2NnNSVm1LS3FzNGlBNmNQaGhJME1xST0=$9A4hF_YAuvQ5obgVAqNKPCYcEjKensW4IQMovwHtwkF4VYPoHbKxJw!!&v=MTc0MjFYMUx1eFlTN0RoMVQzcVRyV00xRnJDVVJMK2ZZT1pwRnkva1Y3dk1NaVhJWkxHNEg5VE1ybzlFWm9SOGU=