Evolution Mechanism of Interconnected Vertical Fractures in the Overburden of Longwall Coal Mining

<div>Histogram in water inrush and normal areas of 31401 working face of Bulianta Coal Mine [<a href="/journals/geofluids/2020/8862517/#B25">25</a>]: (a) overburden histogram in water inrush area; (b) overburden histogram in normal area.</div>

Geofluids

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Figure 9

Figure 9: Evolution Mechanism of Interconnected Vertical Fractures in the Overburden of Longwall Coal Mining 