一、前言随着采煤深度的增加。日本煤矿出现了瓦斯突出、底鼓、冲击地压及作业现场温度升高等很多井下安全问题。就井下条件来说,九州地区煤矿的特点是,空气温度及湿度较高,地温增加率大,矿井涌水温度很高,并且涌水量也较大。另一方面,北海道地区的煤矿,即使开采深度为1000米,夏季井下也需要用人工冷却。上述这种趋势会越来越明显。 First, the foreword With the increase of coal mining depth. There have been many underground safety problems in Japan's coal mines, such as gas outburst, kick-off drum, rock burst and temperature rise at the job site. In terms of downhole conditions, coal mines in Kyushu are characterized by high air temperature and humidity, high rate of increase in ground temperature, high gushing water temperature, and large influx of water. On the other hand, the coal mines in Hokkaido area need to be manually cooled down to a depth of 1,000 m. This trend will be more obvious.