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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 20 ft (6 m) wide on 50-ft (15-m) centers and are 300 ft (90 m) in length. Room entries are 15 ft (4.5 m) in width on 50-ft ( 15-m) centers. Crosscuts between both rooms and entries are placed on 100-ft (30-ft) centers. A barrier pillar 50 ft (15 m) in width will be left on three sides on the panel. A sketch of the mining panel in each of the following cases: a. No pillar recovery b. Recovery of room and entry pillars c. Room width increased to 30 ft (9 m), with timbering, 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 20 ft (6 m) wide on 50-ft (15-m) centers and are 300 ft (90 m) in length. Room entries are 15 ft (4.5 m) in width on 50-ft ( 15-m) centers. Crosscuts between both rooms and entries are placed on 100-ft (30-ft) centers. A barrier pillar 50 ft (15 m) in width will be left on three sides on the panel. A sketch of the mining panel in each of the following cases: a. No pillar recovery b. Recovery of room and entry pillars c. Room width increased to 30 ft (9 m), with timbering, and no pillar recovery

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
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 20 ft (6 m) wide on 50-ft (15-m) centers and are 300 ft (90 m) in length. Room entries are 15 ft (4.5 m) in width on 50-ft ( 15-m) centers. Crosscuts between both rooms and entries are placed on 100-ft (30-ft) centers. A barrier pillar 50 ft (15 m) in width will be left on three sides on the panel. A sketch of the mining panel in each of the following cases:
a. No pillar recovery
b. Recovery of room and entry pillars
c. Room width increased to 30 ft (9 m), with timbering, and no pillar recovery

E56 15 m) Barrier pillar 30 Rooms 20 ft (6 m) wide 300 t (91 m) long 50 t (15 m) centers Crosscuts @ 100 ft (30 m) centers Panel 0000000 3 room entries 15 (4.5m) wide 50 R (15 m) centers Crosscuts @ 100 t (30m) centers
Transcribed Image Text:E56 15 m) Barrier pillar 30 Rooms 20 ft (6 m) wide 300 t (91 m) long 50 t (15 m) centers Crosscuts @ 100 ft (30 m) centers Panel 0000000 3 room entries 15 (4.5m) wide 50 R (15 m) centers Crosscuts @ 100 t (30m) centers
106 A panel of 30 rooms in a room and pillar coal mine is to be driven from 10 of three room entries connecting to panel entries. The rooms are driven e 16 m) wide on 50-ft (15-m) centers and are 300 ft (90 m) in length. Room ntries are 15 ft (4.5 m) in width on 50-ft (15-m) centers. Crosscuts between both rooms and entries are placed on 100-ft (30-m) centers. A barrier pillar S0 aU5 m) in width will be left on three sides on the panel. A sketch of the mining plan appears in Figure 10.21. Compute the percentage recovery for the mining panel in each of the following cases: a. No pillar recovery b. Recovery of room and entry pillars C. Room width increased to 30 ft (9 m), with timbering, and no pillar recovery 56n (15 m) Barrier pillar 30 Rooms 20 ft (6 m) wide 300 ft (91 m) long 50 t (15 m) centers Crosscuts @ 100 ft (30 m) centers Panel 00 0000000 3 room entries 15 t (4.5m) wide 50 ft (15 m) centers Crosscuts 100 ft (30m) centers
Transcribed Image Text:106 A panel of 30 rooms in a room and pillar coal mine is to be driven from 10 of three room entries connecting to panel entries. The rooms are driven e 16 m) wide on 50-ft (15-m) centers and are 300 ft (90 m) in length. Room ntries are 15 ft (4.5 m) in width on 50-ft (15-m) centers. Crosscuts between both rooms and entries are placed on 100-ft (30-m) centers. A barrier pillar S0 aU5 m) in width will be left on three sides on the panel. A sketch of the mining plan appears in Figure 10.21. Compute the percentage recovery for the mining panel in each of the following cases: a. No pillar recovery b. Recovery of room and entry pillars C. Room width increased to 30 ft (9 m), with timbering, and no pillar recovery 56n (15 m) Barrier pillar 30 Rooms 20 ft (6 m) wide 300 ft (91 m) long 50 t (15 m) centers Crosscuts @ 100 ft (30 m) centers Panel 00 0000000 3 room entries 15 t (4.5m) wide 50 ft (15 m) centers Crosscuts 100 ft (30m) centers
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