炭鉱坑内の突出現象に関する若干の考察

抄録

Many researchers presented till now several theories on outbursts process of coal, gas or rock. In Japan almost all the people in coal mines believe that the outbursts phenomena of coal and gas are quite different from that of rock. According to a certain Russian scientist, however, these are sometimes originally same and caused by strain potential energy which was enclosed in strata during mountain-making movement.
In order to find the most suitable means to protect us from an outburst catastrophe, it is very necessary to know the value of this potential strain energy.
In this paper the energy with three factors, i.e. kinetic energy of an outburst, temperature increase of outbursted coal or rock and breaking energy of coal seam or rock strata, are theoretically analysed and practically valued.
This paper shows the greatness of potential strain energy of an outburst-more than 10 times as much as static earth pressure on the spot-and the boring of long bore holes into seams are not enough for protection from outburst catastrophes. Instead the author offered to measure of changes of streses in seams.