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Advances in Materials Science and Engineering
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Advances in Materials Science and Engineering
/
2020
/
Article
/
Tab 1
/
Research Article
Roof Movement and Failure Behavior When Mining Extra-Thick Coal Seams Using Upward Slicing Longwall-Roadway Cemented Backfill Technology
Table 1
The foundation structure of different excavation steps in a mining cycle.
n
s
l
1
l
2
l
3
l
4
1
a
3
a
0
4
a
2
a
3
a
a
3
a
3
2
a
2
a
a
3
a
4
2
a
2
a
2
a
2
a
5
3
a
a
2
a
2
a
6
3
a
a
3
a
a
7
4
a
0
3
a
a
