Failure Characteristics and Stability Control of Bolt Support in Thick-Coal-Seam Roadway of Three Typical Coal Mines in China

Figure 3

The results of the roadway monitoring: (a) the monitoring results of surface displacement in the roadway; (b) the monitoring results of axial load of flexible bolts and cable; (c) borehole camera images and corresponding analysis.

(a)

(b)

(c)