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

<div>Roof deformation monitoring data from the repaired roadway. (a) Roof monitoring data at 540 m. (b) Roof monitoring data at 640 m.</div>

Shock and Vibration

Figure 4: Investigation of the Optimal Layout of the Roadway in Closely Spaced Ultra-Thick Coal Seams Mining with Remaining Coal Pillars 