Research Article
Shield-Roof Interaction in Longwall Panels: Insights from Field Data and Their Application to Ground Control
Figure 16
Loading degree of a shield-supporting cycle in different longwall retreating timings. (a) 8 h, (b) 15 h, (c) 17.8 h, and (d) 22 h.
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(b) |
(c) |
(d) |