Investigations of Coal-Rock Parting-Coal Structure (CRCS) Slip and Instability by Excavation

<div>Cloud chart of rockburst danger index <i>φ</i> in the rock parting zone. Notes: the index <i>φ</i> denotes the rockburst danger level (safe: 0–0.25; weak: 0.25–0.5; medium: 0.5–0.75; strong: 0.75–0.1).</div>

Shock and Vibration

fig17

Figure 17

Figure 17: Investigations of Coal-Rock Parting-Coal Structure (CRCS) Slip and Instability by Excavation 