Breaking and Instability Movement Characteristics of High-Position Double-Layer Hard Thick Strata due to Longwall Mining

<div>Movement variations of two layers of magmatic rock before and after their breaking. (a) LMR movement before and after its breaking. (b) UMR movement before and after its breaking.</div>

Shock and Vibration

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Figure 8

Figure 8: Breaking and Instability Movement Characteristics of High-Position Double-Layer Hard Thick Strata due to Longwall Mining 