Evaluation of Ground Surface Pregrouting in a Mountain Tunnel Based on FAHP

Table 6

Permeability rate and curve types obtained from the five pairs of the test holes.

Depth (m)	Before or after grouting	Number of boreholes
		1	2	3	4	5
0–7	Before	53.97/D	50.91/D	65.61/D	62.13/D	53.78/B
	After	4.90/A	5.12/A	4.69/B	4.67/B	4.72/A
7–13	Before	47.12/D	45.50/D	42.00/D	41.18/D	46.21/C
	After	4.31/A	4.26/B	4.81/C	5.18/D	4.33/A
13–20	Before	34.42/C	30.36/D	36.16/D	41.10/D	36.19/A
	After	3.44/A	3.69/A	3.21/A	3.96/B	3.15/A

Note: the unit of the permeability rate is Lu.