赤平炭鉱における困難な自然条件下の保安生産技術について

抄録

Each colliery under different geological conditions has accumulated the original know-hows in mining methods, safety measures, etc.
These know-hows have been developed through continuous study and various experiences for a long time.
In the Akabira colliery, under inferior mining conditions due to steeply inclined strata and existence of many faults and folds, we have struggled against spontaneous combustion and gas outburst since opening the mine.
Several noteworthy know-hows mentioned below have been developed in our colliery and their details and developing process are described in this report:
(1) Countermeasure to gas outburst by the execution of release boring with a diameter of 200 mm to 250mm;(2) Drilling technique for large diameter holes (75mm-1, 500mm), so-called “The large diameter ring shaped boring”
(3) Centralized monitoring system with the tube bundle for the early detection of spontaneous combustion;
(4) Fly ash slurry transportation and filling system from the operation plant installed on surface;
(5) Mechanized longwall mining system for steeply inclined coal seam; and
(6) Operation of fluidized-bed combustion boiler.