Research Article
Ground Settlement of High-Permeability Sand Layer Induced by Shield Tunneling: A Case Study under the Guidance of DBN
Table 2
Parameters and results of pumping test.
| | Pumping time (h) | Drawdown (m) | Pumping stability time (h) | Permeability coefficient (m/d) | Radius of influence (m) |
| | First drawdown | 20 | 2.71 | 8 | 25.50 | 214 | | Second drawdown | 21 | 4.09 | 8 | 21.12 | 214 | | Average value | 20.5 | 3.40 | 8 | 23.31 | 214 |
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