Overburden Migration and Failure Characteristics in Mining Shallow Buried Coal Seam with Thick Loose Layer

<div>Layout of observation lines in observation surface. (a) Lines on observation surface <i>y</i> = 250 m. (b) Lines on observation surface <i>x</i> = 300 m.</div>

Advances in Materials Science and Engineering

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Figure 4

Figure 4: Overburden Migration and Failure Characteristics in Mining Shallow Buried Coal Seam with Thick Loose Layer 