Research and Application of Integrated Presplitting Blasting in Nonpillar Mining Technology

Figure 8

Related parameters of test working face. (a) The test working face is 1306 working face, and the roadway reserved for nonpillar mining is 461 m. (b) The roadway, which will reserved for nonpillar mining, has a rectangular section of 5.2 m × 2.6 m and adopts the support method of “anchor cable-bolt-plastic net.” (c) Integrated column chart of roof lithology of the roadway shows K2 limestone has an average thickness of 8.9 m.

(a)

(b)

(c)