Stress Distribution and Optimum Spacing Determination of Double-Withdrawal-Channel Surrounding Rocks: A Case Study of Chinese Coal Mine

Figure 11

Principal stress cloud diagrams when Panel 31113 distance was 20 m from penetration. (a) When the main and auxiliary withdrawal spacing is 30 m, (b) when the main and auxiliary withdrawal spacing is 25 m, and (c) when the main and auxiliary withdrawal spacing is 20 m.

(a)

(b)

(c)