Use of the Equivalent Mining Height Method for Understanding Overlying Strata Movement and Stress Distribution in an Isolated Coal Pillar

Figure 6

Displacement contour of overlying strata on coal pillar with varied equivalent mining height (mm). (a) Isolated coal pillar before mining. (b) Displacement of overlying strata with equivalent mining height of 0.8 m. (c) Displacement of overlying strata with equivalent mining height of 1.6 m. (d) Displacement of overlying strata with equivalent mining height of 2.4 m. (e) Displacement of overlying strata with equivalent mining height of 3.2 m. (f) Displacement of overlying strata with equivalent mining height of 4.0 m.

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