Structure Strengthening Method for Enhancing Seismic Behavior of Soft Tunnel Portal Section

Table 5

Growth rate of contact stress peak.

Section	Case 2 (%)	Case 3 (%)	Case 4 (%)
A	15.95	32.16	41.69
B	13.92	21.98	36.68
C	7.93	17.29	26.41
D	8.60	15.05	20.43
E	2.27	4.55	9.09