Advances in Civil Engineering / 2018 / Article / Fig 3

Research Article

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

Figure 3

Movement law of the overburden strata when only one hard rock exists: advancing distances of the working face are (a) 30 m, (b) 40 m, and (c) 50 m.

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