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

Table 4

Grouting volume per borehole at the three sections.

Depth (m)	Number of boreholes
	1	2	3	4	5
0–7	4.50	4.48	4.17	4.67	5.31
7–13	1.47	1.52	1.28	1.64	1.99
13–20	1.53	1.48	1.72	2.01	1.13
Total	7.50 (0.9%)	7.48 (0.7%)	7.17	8.32 (12%)	8.43 (13%)

Please note that “(0.9%)”, “(0.7%)”, “(12%)”, and “(13%)” are the excess rates.