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

<div>Instability migration rules of overlying strata in mining. (a) The working face advanced to 120 m. (b) The working face advanced to 138 m.</div>

Advances in Civil Engineering

fig3

Figure 3

Figure 3: Accurate Perception of Rock Strata Movement for Environmental Protection in Coal Mining: Taking Thick and Hard Roof Cooperative Control as an Example 

Figure 3 | Accurate Perception of Rock Strata Movement for Environmental Protection in Coal Mining: Taking Thick and Hard Roof Cooperative Control as an Example 