水力ジェットの主要パラメータと水力打撃時の炭層内応力分布について

抄録

Since this new mining method was introduced to Japan, many experimental works have been carried out in laboratories and at collieries. Many good results were reported already and some coal mines have achieved very high productivity.
But development of this technique requires theoretical analysis as well as experimental works on parameters of high-pressure jet directed against the face, and stress distribution in coal seams in hydraulic crushing.
The auther analyzed these problems theoretically and mathematically. Results acquired show relations between parameters of jet and stress distribution in coal seams related to distance between face and nozzle.