Study on Dynamic Response Characteristics and Damage Mechanism of Tunnel Lining at Entrance of Shallow Bias Tunnel

Table 5

Key points A1–A8 maximum principal stress value and corresponding time C25 =1.78.

Key point	A1	A2	A3	A4	A5	A6	A7	A8
Stress (MPa)	1.993	1.838	1.788	1.848	1.875	1.993	1.533	1.951
Time (s)	5.418	9.565	5.289	5.386	2.939	5.321	2.825	9.257