道路交通工程中的瓦斯隧道建设存在瓦斯爆炸的重大危险,其影响因素十分复杂.分析国内外典型隧道瓦斯爆炸事故,获得导致隧道瓦斯爆炸的危险源;运用事故树理论,建立隧道瓦斯爆炸事故树模型,计算事故发生的最小割集和最小径集,发现导致瓦斯爆炸有380种途径,预防瓦斯爆炸事故有2个集合;计算事故树结构重要度,认为防止隧道瓦斯爆炸事故的重点应放在机电管理缺陷和瓦斯管理缺陷上;最后制定了瓦斯隧道在建期瓦斯爆炸事故预防措施.分析结果表明,在防治瓦斯隧道瓦斯爆炸事故中应把防止瓦斯积聚放在首位,控制引爆火源其次,以瓦斯隧道安全施工管理为基础.

The gas tunnel of the road traffic engineering in its construction stage faces the gas explosion risk, with very complex influencing factors. The typical tunnel gas explosions both at home and abroad are analyzed,to explore the sources of the gas explosion hazard. Through the FTA theory, an FAT model of the tunnel gas explosion is built, the minimum cut sets and the minimum path sets of accidents are computed, 380 ways leading to the gas explosion and 2 sets preventing the gas explosion are identified. The FTA important structure is computed, the faulty electromechanical and gas managements are considered as the main issues in considering the prevention of the tunnel gas explosion. Finally the countermeasures to prevent tunnel gas explosion are established. It is shown that in the prevention and control of the gas explosion, the prevention of the gas accumulation should be put in the first place, and the control of the spark origin in the second place, based on the safety construction management of the gas tunnel.