Research Article
Limit Drainage of Separated Tunnel Based on Ecological Groundwater Table: A Case Study
Table 3
The allowable drainage calculation parameters.
| | Parameter type | Parameter value |
| | Permeability coefficient of surrounding rock K (m/d) | 0.3 | | Specific yield μ | 0.02 | | Aquifer thickness H (m) | 30 | | Water conductivity coefficient of aquifer T (m2/d) | 9 | | Equivalent circle radius of tunnel cross section R0 (m) | 10.8 | | Tunnel length passing through the aquifer L (m) | 1000 | | Expansion width of tunnel B (m) | 2R0 = 67.86 | | Distance between two tunnels D (m) | 20 | | Average annual precipitation (mm) | 1359 | | Precipitation infiltration coefficient p | 0.2 |
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