Experimental Study on Characteristics of Seismic Damage and Damping Technology of Absorbing Joint of Tunnel Crossing Interface of Soft and Hard Rock
Table 6
Amplification factors of PGA.
Section
Direction
PGA amplification factor
Working condition A
Working condition B
Working condition C
1–1
Vertical
1.00
1.85 (85%)
1.67 (67%)
Horizontal
1.00
1.68 (68%)
1.43 (43%)
2–2
Vertical
1.00
1.84 (84%)
1.66 (66%)
Horizontal
1.00
1.66 (66%)
1.42 (42%)
3–3
Vertical
1.00
1.82 (82%)
1.66 (66%)
Horizontal
1.00
1.66 (66%)
1.42 (42%)
4–4
Vertical
1.00
1.84 (84%)
1.12 (12%)
Horizontal
1.00
1.66 (66%)
1.07 (7%)
5–5
Vertical
1.00
1.82 (82%)
1.06 (6%)
Horizontal
1.00
1.66 (66%)
1.03 (3%)
The values in brackets are the percentage increase of PGA amplification factor under condition of soft rock or interface of soft and hard rock relative to condition of hard rock.
