Research Article
Evaluation of Water Retention Capacity of Bulkheads in Underground Coal Mines
Table 4
Connectivity coefficients of water conducting pathway of faults in surrounding rock.
| | Connectivity coefficient of water conducting pathway m | Properties of surrounding rock | Water pressure (MPa) | Fault scale | LD/L | Properties of fault | | Type | Drop (m) | Shape | Dynamics |
| | 8–10 | Hard | ≥5 | Extra large | ≥50 | ≤1 | Normal fault | Tensile | | 5–7 | Medium hard | 3–5 | Large | 20–50 | 1–10 | Normal fault | Tensile | | 3–4 | Soft | 2–3 | Medium | 5–20 | 10–50 | Translational fault | Shear | | 1–2 | Extremely soft | ≤2 | Small | ≤5 | ≥50 | Reverse fault | Compressional |
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