Research Article
Evaluation of Water Retention Capacity of Bulkheads in Underground Coal Mines
Table 7
Connectivity coefficients of water conducting pathways of fractures in fractured zone of surrounding rocks of Panel No. 21102.
| | Connectivity coefficient of water conducting pathway m | Stability level of surrounding rock | Thickness of fractured zone Lp (cm) | Water pressure P (MPa) | Span length B (m) | Types of bulkhead | Properties of surrounding rock |
| | 9–10 | Fair | 100–150 | 8.32 (TR) | 8.4 | Inverted pyramid | Semi-coal and semi-rock | | 9–10 | Fair | 100–150 | 8.00 (MR) | 8.4 | Inverted pyramid | Semi-coal and semi-rock |
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