The Mechanical and Fracturing of Rockburst in Tunnel and Its Acoustic Emission Characteristics
Table 2
Experimental results of a rockburst in tunnel.
Horizontal force (kN)
Peak force of axially direction (kN)
Fracturing characteristics during rockburst evolution
100
2223
When the axial loading reaches 1927 kN, the rock granules catapult from the surrounding rock, and then flake peeling occurs in the surrounding rock. When the axial loading reaches 2128 kN, “V-shaped” rock burst pits appear.
200
2492
When the axial loading reaches 2127 kN, the rock granules catapult from the surrounding rock, then flake peeling appears with a small amount of rock dust discharged as a mist. When the axial loading reaches 2437 kN, “V-shaped” rock burst pits appear.
300
2423
When the axially loading reaches 1754 kN, the rock granules and flake peeling catapult from the surrounding rock. When the axially loading reaches 2400 kN, “V-shaped” rock burst pits appear.
