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Advances in Civil Engineering
/
2018
/
Article
/
Fig 11
/
Research Article
Pressure-Arching Characteristics in Roof Blocks during Shallow Coal Mining
Figure 11
Symmetric pressure-arch structure of two key blocks with different block sizes. (a)
L
=
10
m. (b)
L
=
14
m. (c)
L
=
20
m.
(a)
(b)
(c)