北海道におけるガス突出発生に関する地質学的考察
1974 年 90 巻 1039 号 p. 589-594
詳細
1974 年 90 巻 1039 号 p. 589-594
In this paper, the outburst of gas and coal has been studied, from the view point of geological structure in coal field.
The results obtained are as follows:
1) Geologically, the nothern district of Sorachi coal field including the collieries such as Sunagawa, Utashinai, Akabira etc. has the most complex structure, particularly with many faults, in Hokkaido coal field. In this district, a lot of weakened zones of coal seams and rock layers with high pressed and much quantity of free gas are observed.
2) It should be especially noticed that the blasting in the crossing structure is apt to be the over charged blasting and the bottom shock blasting, owing to the frequent changes of rock and coal strength in drifting. And even in the lower potential zones, the shock of the blastings mentioned above may give rise to the outburst of gas and coal.
