Study on Pressure Relief Technology of High-Pressure Water Jet of Residual Coal Pillar in Overlying Goaf in Close Seam Mining

Figure 15

Contour map of vertical stress around slots with different spacings in Section 1. (a) 3.0 m. (b) 4.0 m. (c) 5.0 m.

(a)

(b)

(c)