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

<div>Data from the hydraulic support before and after overfilling the roadway. (a) Data from the hydraulic support in January. (b) Data from the hydraulic support in February.</div>

Shock and Vibration

fig15

Figure 15

Figure 15: Investigation of the Optimal Layout of the Roadway in Closely Spaced Ultra-Thick Coal Seams Mining with Remaining Coal Pillars 