Research on Surface Failure Law of Working Faces in Large Mining Height and Shallow Buried Coal Seam

<div>Contrast of broken blocks in key strata with surface-fractured wells. (a) The first weighting stage of working face, (b) the first periodic weighting stage, (c) the second periodic weighting stage, and (d) the third periodic weighting stage.</div>

Advances in Civil Engineering

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Figure 7

Figure 7: Research on Surface Failure Law of Working Faces in Large Mining Height and Shallow Buried Coal Seam 