Research Article
Evaluation of Ground Surface Pregrouting in a Mountain Tunnel Based on FAHP
Table 9
Definitions of the evaluation results for each index.
| | Index | Symbol | Range of each evaluation result | Test data | | Excellent | Good | Moderate | Bad |
| | Increase rate of sound velocity in single-borehole test (%) | P11 | >15 | 10–15 | 5–10 | <5 | 16 | | Increase rate of sound velocity in double-borehole test (%) | P12 | >15 | 10–15 | 5–10 | <5 | 7 | | Curve types of water pressure test | P21 | A | B | C | D | A: 60%, B:27%, C: 7%, D: 7% | | Decrease rate of permeability rate (%) | P22 | >80 | 60–80 | 40–60 | <40 | 90 | | Increase rate of the unconfined compressive strength of rock samples (%) | P31 | >15 | 10–15 | 5–10 | <5 | 13 |
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