高温岩体およびマグマの掘削へのウォータージェット技術の応用
1997 年 6 巻 1 号 p. 36-45
詳細
1997 年 6 巻 1 号 p. 36-45
Recent progress in conventional geothermal drilling technology was briefly reviewed. Then a series of fundamental experiments on water jet drilling a hole in hot dry rocks (HDR) and magma performed by the author was summarized. In the experiments, artificial rocks made of refractory materials and some kinds of rocks at elevated temperatures up to 1100 °C were used and flow pressure of the water jet of room temperature at nozzle exit was changed from 2. 45 to 194 MPa. It was discussed how the temperature and physical properties of the target materials, standoff distance, pressure of the water jet, nozzle diameter, and so on influence the jet penetration patterns, depth and volume in the materials.
