Research Article
Experimental Study on the Influence of PVA Content on the Performance of Grouting Material in Deep Stope
Table 5
Record table of impermeability test results.
| Group | PVA content | Penetrating water pressure | Impermeability time | Time for water droplets to converge |
| 1# | 0% | 0.3 MPa | 5 min | 27 s | 2# | 0.2% | 0.3 MPa | 28 min | 49 s | 3# | 0.4% | 0.4 MPa | 7 min | 25 s | 4# | 0.6% | 0.4 MPa | 21 min | 33 s | 5# | 0.8% | 0.4 MPa | 20 min | 32 s | 6# | 1% | 0.4 MPa | 23 min | 40 s |
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