一、前言近年来,日本煤矿的工作面更加向深部推进,瓦斯压力和地压增大,瓦斯突出的危险性正在逐年增高。因此,实行了瓦斯抽放和钻孔排放等防止对策。但还不能达到完全防止。仅从近年来看,包括小规模在内的,也发生过多次的瓦斯突出。 I. Foreword In recent years, the working face of Japan’s coal mines has been further advanced to the depths. The pressure and pressure of gas have increased. The danger of gas outburst is increasing year by year. Therefore, the implementation of gas drainage and drilling emissions and other countermeasures. But still can not achieve completely prevent. Only in recent years have seen, including small-scale, there have been many times the gas outburst.