Accurate prediction of the tendency of spontaneouscombustion risk in mining coal layers is of great importance in production safety of coal mine.
正确预测开采煤层自燃发火的趋势与危险性，对煤矿安全生产具有重要的指导意义。
2
The isolated island working face is surrounded with the goaf and its Surrounding coal column and goaf have a tendency of spontaneouscombustion.
孤岛综放工作面四周均与采空区相连，其四周煤柱和工作面采空区易于出现自燃发火。
3
There exist high gas and serious spontaneouscombustiontendency at the same time in many coal mines in china. When the gas is pumped, it is easy to cause the spontaneouscombustion of residual coal.