A panel of 30 rooms in a room-and-pillar coal mine is to be driven from a set of three room entries connecting to panel entries. The rooms are driven on 100 ft (30 m) centers; they are 16 ft (4.8 m) in width and 300ft (90 m) in length. Room entries are also 16 ft (4.8 m) in width on 100t (30 m) centers. Crosscuts between both rooms and entries are placed on 100 ft (30 m) centers. A barrier pillar 100 ft (30 m) in width will be left on three sides of the panel. A sketch of the mining plan appears in Figure 10.18. Compute the percentage recovery for the mining panel in each of the following cases: a. No pillar recovery b. Recovery of chain pillars in rooms and entries c. Room width increased to 20 ft (6 m) and no pillar recovery
A panel of 30 rooms in a room-and-pillar coal mine is to be driven from a set of three room entries connecting to panel entries. The rooms are driven on 100 ft (30 m) centers; they are 16 ft (4.8 m) in width and 300ft (90 m) in length. Room entries are also 16 ft (4.8 m) in width on 100t (30 m) centers. Crosscuts between both rooms and entries are placed on 100 ft (30 m) centers. A barrier pillar 100 ft (30 m) in width will be left on three sides of the panel. A sketch of the mining plan appears in Figure 10.18. Compute the percentage recovery for the mining panel in each of the following cases: a. No pillar recovery b. Recovery of chain pillars in rooms and entries c. Room width increased to 20 ft (6 m) and no pillar recovery
Chapter2: Loads On Structures
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Problem 1P
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A panel of 30 rooms in a room-and-pillar coal mine is to be driven from
a set of three room entries connecting to panel entries. The rooms are
driven on 100 ft (30 m) centers; they are 16 ft (4.8 m) in width and 300 fn
(90 m) in length. Room entries are also 16 ft (4.8 m) in width on 100 ft
(30 m) centers. Crosscuts between both rooms and entries are placed
on 100 ft (30 m) centers. A barrier pillar 100 ft (30 m) in width will be
left on three sides of the panel. A sketch of the mining plan appears in
Figure 10.18. Compute the percentage recovery for the mining panel in
each of the following cases:
a. No pillar recovery.
b. Recovery of chain pillars in rooms and entries
c. Room width increased to 20 ft (6 m) and no pillar recovery
100 ft (30 m) Barrier pillar
30 Rooms
16 ft (4.8 m) wide
300 ft (91 m) long
Crosscuts @ 100 ft
(30 m) centers
Panel
3 room entries
16 ft (4.8 m) width
100 ft (30 m)
"centers
Crosscuts @ 100
(30 m) centers
FIGURE 10.18. Panel in room-and-pillar mine. See Problem 10.2.
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