Applied Research of Water Jet Technology in Preventing Rock Burst Occurred in Roadways

Figure 12

The schematic diagram of water jets punching initial borehole wall. (a) The plan view. (b) A-A cross-section view. Note: 1 is the nozzle; 2 is the water jet drill bit; 3 is the water jet; and 4 is the initial borehole wall.

(a)

(b)