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

Table 6

Description and rating for rock mass quality.

Geological factors								Surface rock quality classification characteristics
RQD (%)	No.				SRF		value
90~100	1	1	3.9	0.88	1	1	133~443	I The rock quality is very good and stable
75~90	2	3					66~133	II Good and stable rock quality
50~75	3	5					32~66	III Rock quality is medium, basically stable
25~50	4	7					12~32	IV Poor and unstable rock quality
0~25	>4	9					1~12	V The rock quality very poor and unstable