Similar Physical Modeling of Roof Stress and Subsidence in Room and Pillar Mining of a Gently Inclined Medium-Thick Phosphate Rock

Figure 8

Lower roof stress and overlying rock subsidence in the four-step excavation of the stope structure with 5 m ore pillars: (a, b) first step; (c, d) second step; (e, f) third step; and (g, h) fourth step.

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