Roof Movement and Failure Behavior When Mining Extra-Thick Coal Seams Using Upward Slicing Longwall-Roadway Cemented Backfill Technology

<div>The performance requirement of cemented backfill: (a) the elastic modulus of backfill versus the maximum bending moment of the roof; (b) the elastic modulus and strength requirement of backfill for different slices.</div>

Advances in Materials Science and Engineering

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Figure 10

Figure 10: Roof Movement and Failure Behavior When Mining Extra-Thick Coal Seams Using Upward Slicing Longwall-Roadway Cemented Backfill Technology 