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

Table 7

Increase rate of the unconfined compressive strength of the rock samples before and after grouting.

Number of rock samples	Before grouting (MPa)	After grouting (MPa)	Increase rate of unconfined compressive strength of the rock samples (%)
P1-1	10.5	12.3	17.1
J1-2	13.5	15.3	13.3
P2-1	19.2	21.2	10.4
J2-2	21.7	23.4	7.8
P3-1	15.3	17.1	11.8
J3-2	14.1	16.3	15.6
P4-1	13.2	15.6	18.2
J4-2	18.3	20.6	12.6
P5-1	17.1	19.4	13.5
J5-2	18.7	20.3	8.6