一、煤与瓦斯突出分级的意义及可行性我国是世界上煤与瓦斯突出威胁最严重的国家,对于突出和其防治措施的研究,一直是煤矿安全技术的重要课题。多年研究和生产实践已积累了丰富的经验,并在一定程度上控制了突出的发生及其危害实践表明,即使突出最严重的矿井,也并非所有井层都具有严重突出危险性;而最严重的井层,其突出危险程度也随区 First, the significance of coal and gas outburst grading significance and feasibility China is the world’s coal and gas out of the most serious threat to the country, for the prominent and its prevention and control measures has been an important issue in coal mine safety technology. Years of research and production practices have accumulated rich experience and, to some extent, controlled the outbreaks and their hazards. Practice shows that not all wells that are most prominent are not significantly salient, and the most serious Of the well, its prominent degree of danger also with the area