Presplitting Blasting the Roof Strata to Control Large Deformation in the Deep Mine Roadway

Figure 9

Working resistance monitoring curves of hydraulic support. (a) Working resistance monitoring curves of hydraulic support in the upper area. (b) Working resistance monitoring curves of hydraulic support in the middle area. (c) Working resistance monitoring curves of hydraulic support in the lower area.

(a)

(b)

(c)