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