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

Table 6

Growth of safety factor.

Section	Case 2 (%)	Case 3 (%)	Case 4 (%)
A	16.69	30.30	44.73
B	17.03	30.47	40.50
C	17.82	31.21	43.97
D	20.72	65.22	81.31
E	31.76	56.11	90.16