Research on Hydraulic Fracturing Technology of Long Boreholes along Strata of High Vast Thick Coal Seam

<div>Comparison of surface structures of coal samples before and after fracturing: (a) coal sample before fracturing and (b) coal sample after fracturing.</div>

Advances in Civil Engineering

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Figure 6

Figure 6: Research on Hydraulic Fracturing Technology of Long Boreholes along Strata of High Vast Thick Coal Seam 