非煤气地层瓦斯溢出的启示  

Thoughts on Gas Overflow from the Non-gas Stratum

作　　者：陈元元[1] 李法昶[1] 

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《铁道工程学报》2010年第2期64-68,共5页Journal of Railway Engineering Society

摘　　要：研究目的:某线财神庙隧道在志留系片岩地层施工中出现瓦斯溢出。本文通过对该隧道瓦斯的监测、测试评估,以预测掌子面瓦斯的涌出量,分析瓦斯来源,并提出防治措施。研究结论:(1)财神庙隧道的瓦斯溢出属偶然现象,围岩中的瓦斯并非以吸附状态存在,而呈游离状态;瓦斯的含量低、无压力,瓦斯的自然流量小,且衰减比较快;全工区为低瓦斯工区。(2)自然地质环境是复杂的,瓦斯的溢出不仅发生于含煤气等地层中,在非含煤含气地层也可能偶尔发生。(3)对类似隧道的瓦斯溢出宜审慎对待,既要认清其造成危害程度的有限性,又不可轻视,有备而无患。Research purposes： Gas overflow appeared in the Silurian schist stratum during construction of Caishenmiao Tunnel. The tunnel gas was monitored, tested and evaluated for predicting the volume of the gas overflow. This paper analyzes the sources of gas and offers the preventive measures for the gas. Research conclusions：（ 1 ） The gas overflow in the Caishenmiao Tunnel was accidental phenomena and gas in the surrounding rock was not in adsorbed state, but in free state, with very low gas content, no pressure, small natural flow of gas and fast attenuation. So the construction area was in low gas area. （2） As the natural and geological environments were complicated, the gas not only overflowed from the gas -bearing stratum, but also probably overflowed from the other stratum occasionally. （3） The gas overflow should be dealt with carefully. It should be known clearly that the hazard of such gas was small and the gas hazard could be neglected as well. The some measures should be taken so as to avoid the gas hazard.

关 键 词：隧道 瓦斯溢出 监测 测试评估 处理措施 

分 类 号：U457[建筑科学—桥梁与隧道工程]