Study on the Influence of Cracks on the Mechanical Performance of Tunnel Lining Structure Based on Fracture Mechanics Theory

Table 7

Comparison between K_I theoretical value and numerical calculation results.

Crack depth a (cm)	KI numerical value (MPa·m^1/2)	KI theoretical calculated value (MPa·m^1/2)	Error (%)
3	0.35	0.31	−11.43
6	0.77	0.85	10.39
9	1.14	1.25	9.65
12	2.13	2.04	−4.23
15	3.51	3.31	−5.70
18	5.35	4.93	−7.85