Geological Structural Surface Evaluation Model Based on Unascertained Measure

Table 1

Structural plane evaluation classification standard.

Influencing factor indicator	Classification criteria
	I grade ()	II grade ()	III grade ()	IV grade ()	V grade ()
Uniaxial compressive strength Rc (MPa)	>150	150~120	120~80	80~30	30~0
Rock quality designation RQD (%)	100~90	90~80	80~60	60~30	30~0
Rock integrity coefficient Kv	0.75~1	0.55~0.75	0.35~0.55	0.15~0.35	0~0.15
Joint trace length (m)	0~0.3	0.3~0.5	0.5~0.8	0.8~1.2	1.2~1.5
Strike (°)	90~75	75~60	60~45	45~30	30~0
Dip angle (°)	0~30	30~45	45~60	60~75	75~90
Fracture roughness coefficient JCR	20~12	12~8	8~4	2~4	2~0
Joint opening degree (mm)	0~0.2	0.2~1.0	1.0~2.0	2.0~5.0	>5
Rock moisture content (%)	0~20	20~30	30~45	45~65	65~100