Research and Application of Integrated Presplitting Blasting in Nonpillar Mining Technology

Figure 11

The nonpillar entire mining process. (a) Applying constant resistance and large deformation anchor cable. (b) Roof presplitting and slitting. (c) Roof shallow hole blasting. (d) Hydraulic supports in the roadway and after the working face is mined, the roof of the goaf gradually collapses. (e) The roadway is stable, and the hydraulic supports are withdrawn.

(a)

(b)

(c)

(d)

(e)