Study on Energy Release of Surrounding Rock under the Multiple Unloading Disturbance during Tunnel Excavation

Table 5

Comparison of the numerical calculation result and acoustic detecting result of the damage zone of the Jinping 2# Laboratory.

Group number	Detection hole number	Surrounding rock damage depth (m)
1	A	2.5
	B	2.3
	C	1.9
2	A	2.3
	B	2.3
	C	2.1
Average depth of the testing result	—	2.2
Numerical simulation result	—	2.3