Fracture Mechanism in Overlying Strata during Longwall Mining

<div>The influence of excavation length on the fracture of KS: (a) the result of yield criterion changing with excavation length; (b) the curve of AID changing with excavation length.</div>

Shock and Vibration

fig7

Figure 7

Figure 7: Fracture Mechanism in Overlying Strata during Longwall Mining 