Advances in Civil Engineering / 2018 / Article / Fig 4

Research Article

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

Figure 4

Movement law of the overburden strata when two hard rocks exist: advancing distances of the working face are (a) 35 m, (b) 45 m, (c) 50 m, and (d) 90 m.
(a)
(b)
(c)
(d)

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