Thick-Anchored Dual-Layer Locking Supporting Technique in Gob-Side Entry Driving with the Narrow Pillar: A Case Study

<div>Flexible bolts. (a) Type I in which pretightening force is applied through the lockset. (b) Type II in which pretightening force is applied through the nut.</div>

Geofluids

fig7

Figure 7

Figure 7: Thick-Anchored Dual-Layer Locking Supporting Technique in Gob-Side Entry Driving with the Narrow Pillar: A Case Study 