Influence of Shield Tunnel Oblique Penetration Construction on Existing Large-Span Masonry Structures

Table 3

Correspondence between maximum principal strain and damage grade.

Damage level	Negligible (%)	Very slight (%)	Slight (%)	Medium (%)	Serious (%)
Maximum principal strain	0∼0.05	0.05∼0.075	0.075∼0.15	0.15∼0.3	>0.3