Table 7
Comparative analysis of antistaggering effect
Type
Damage range
Damage degree
Hanging wall (cm)
Footwall (cm)
Total (cm)
Crack length (cm)
With or without spalling and block falling
Double-line box tunnel
14
96
236
766
Apparent spalling and block falling
Double-line box arch tunnel
84
60
144
311
No spalling
Type
Damage range
Damage degree
Hanging wall (cm)
Footwall (cm)
Total (cm)
Crack length (cm)
With or without spalling and block falling
Double-line box tunnel
14
96
236
766
Apparent spalling and block falling
Double-line box arch tunnel
84
60
144
311
No spalling
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