Study on Sensitivity Parameters Analysis of Grouting Reinforcement Underpassing Existing Subway Tunnel by Numerical Modeling

Table 4

Comparison of grouting reinforcement effect in various simulation schemes.

Scheme number	Average surface settlement (mm)	Average value of void pressure in area II (MPa)	Average section reduction rate (%)	Number of fissures	Maximum value of principal stress difference (MPa)
1	56	0.79	1.66	877	0.60
2	51	0.77	1.45	1489	0.50
3	--	0.75	1.61	2087	0.90
4	59	0.91	2.20	896	0.60
5	55	0.77	1.57	1396	1.00
6	45	0.76	1.54	2055	0.90
7	55	0.77	1.57	946	0.65
8	50	0.75	1.56	1428	0.50
9	--	0.74	0.80	2034	0.65