Prediction of Stope Stability Using Variable Weight and Unascertained Measurement Technique

Table 2

Classification criterion of qualitative indices.

Classification standard	Value	Situation of joint development ()	Situation of pillar ()
	1	Joint is undeveloped, joint  m	Rock is completed and no fracture
	2	Joint is undeveloped, joint spacing 1~3 m, rocks are cut into giant block rock	There are some fractures around the corner
	3	Joint is little developed, joint spacing 0.4~1 m, rocks are cut into block rock	There are cracks on the pillar, and the crack  mm
	4	Joint is developed, joint spacing 0.2~0.4 m, rocks are cut into stone	There are cracks on the pillar, and the crack widths are 5-10 mm
	5	Joint is very developed, joint  m, rocks are cut into crushed stone	The pillar is broken into bulk, the expansion of fracture through the pillar