Safety Mining Technology of Coal Seams in Weathered Zone Based on Ground J-Type Pregrouting Reinforcement

<div>Comparison of the microstructures of rock masses in the weathered zone (2000 magnifications, 20 <i>με</i>): microstructure of the samples in the (a) unreinforced section and (b) after grouting reinforcement.</div>

Advances in Civil Engineering

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Figure 6

Figure 6: Safety Mining Technology of Coal Seams in Weathered Zone Based on Ground J-Type Pregrouting Reinforcement 