Investigation of the Optimal Layout of the Roadway in Closely Spaced Ultra-Thick Coal Seams Mining with Remaining Coal Pillars

<div>30503 working face layout scheme. (a) Scheme 1 roadway layout diagram. (b) Scheme 2 roadway layout diagram.</div>

Shock and Vibration

Figure 5: Investigation of the Optimal Layout of the Roadway in Closely Spaced Ultra-Thick Coal Seams Mining with Remaining Coal Pillars 