A Fuzzy Comprehensive Assessment Approach and Application of Rock Mass Cavability in Block Caving Mining

Table 1

The rock cavability classification based on the influencing factors.

Influencing factors	The ranks of cavability
	I	II	III	IV	V
	>10 MPa	4~10 MPa	2~4 MPa	1~2 MPa	0~1 MPa
RQD	90~100%	75~90%	50~75%	25~50%	0~25%
	Very rough	Rough	Slightly rough	Smooth	Slickenside
	0	<0.1 mm	0.1~1 mm	1~5 mm	>5 mm
	None	Hard filling	Hard filling	Soft filling	Soft filling
		< 5 mm	> 5 mm	< 5 mm	>5 mm
	Dry	Damp	Wet	Dripping	Flowing
Iss	>0.40	0.31~0.40	0.22~0.31	0.13~0.22	0.00~0.13
	0.9	0.7	0.5	0.3	0.1
	0.8~1.0	0.6~0.8	0.4~0.6	0.2~0.4	0~0.2