[Retracted] Classification Method of Rock Structure and Rock Mass Quality of Surface Granite: Geological Disposal of High-Level Radioactive Waste in China

Table 5

Description and rating for rock mass quality.

Geological factors									Rock mass quality classification characteristics
	RQD (%)		Spacing (cm)					value
1; 2	90~100	20	>200	20	2; 5	1; 5	0	84~92	I The rock quality is very good and stable
	75~90	17	60~200	15				75~84	II Good and stable rock quality
	50~75	13	20~60	10				68~75	III Rock quality is medium, basically stable
	25~50	8	6~20	8				60~68	IV Poor and unstable rock quality
	0~25	3	<6	5				52~60	V The rock quality is very poor and unstable