水电工程地下洞室有害气体成因及防治措施

通过介绍地下洞室主要有毒有害气体成分、特征、危害及发生有毒有害气体事故实例，分析、归纳有毒有害气体成因、发生条件、危害方式等特征，提出相关防治措施。有毒气体的检测一般首先检查氧气和可燃易爆气体，其次进行有毒气体检测。有毒气体的防范应尽量避开有毒气体地区，根据工程及有毒气体特征采取封堵、引排、加强通风、选择合适的炸药及合理的钻孔爆破工艺均能减少有毒气体的产生和危害。

Causes for Toxic Gases in Underground Caverns of Hydropower Works and Their Countermeasures

The components,properties and damages of major harmful gases in underground caverns,as well as accidents caused by harmful gases,are presented.The causes,occurring conditions and damages modes of the harmful gases are analyzed and summarized and countermeasures are proposed.Regarding the detection of the harmful gases,oxygen and other inflammable and explosion-causing gases should be detected before toxic gases are detected.Regarding the prevention and control of the harmful gases,areas with harmful gases should be avoided as far as possible and countermeasures,such as gas sealing,gas releasing,ventilation improving,using proper explosives and adopting proper drilling and blasting technologies shall be taken so as to avoid accidents caused by harmful gases.