Calculation Model and Decoupling Coefficient Sensitivity Study of Periphery Hole for Eccentric Decoupled Charge in Highway Tunnels

Table 2

Numerical simulation results of the lateral fracture zone for the surrounding rock mass.

Radial decoupling coefficient	radius of broken lateral rock zone (/cm)					Surrounding rock grade
	RQD = 10 y%	RQD = 35%	RQD = 60%	RQD = 85%	RQD = 95%
4	- -	- -	2	2	2	II
	- -	2	2	2	- -	III
	2	2	2	- -	- -	IV
2	- -	- -	2	2	2	II
	- -	2	2	2	- -	III
	2	2	2	- -	- -	IV
1.33	- -	- -	33	24	22	II
	- -	30	31	23	- -	III
	35	32	32	- -	- -	IV
1	- -	- -	60	52	50	II
	- -	45	52	52	- -	III
	40	49	39	- -	- -	IV