Accurate Perception of Rock Strata Movement for Environmental Protection in Coal Mining: Taking Thick and Hard Roof Cooperative Control as an Example

<div>Relationship between <i>θ</i> (angle between the fracture line and vertical line) and <i>η</i> (ratio of thickness to span) during the first weighting.</div>

Advances in Civil Engineering

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Figure 6

Figure 6: Accurate Perception of Rock Strata Movement for Environmental Protection in Coal Mining: Taking Thick and Hard Roof Cooperative Control as an Example 

Figure 6 | Accurate Perception of Rock Strata Movement for Environmental Protection in Coal Mining: Taking Thick and Hard Roof Cooperative Control as an Example 