Reliability Analysis of Safety Assessment of Buildings above Twin Shield Tunnels Based on Random Field Theory

Table 3

Relationship between the category of building damage and ultimate tensile strain.

Damage level	Severity degree	Maximum tensile strain (%)	Ultimate tensile strain (%)
0	Negligible	0–0.050	0.050
1	Very slight	0.050–0.075	0.075
2	Slight	0.075–0.150	0.150
3	Medium	0.150–0.300	0.300
4	Serious	>0.300	-
5	Very serious	-	-