Research and Application of Rock Burst Hazard Assessment of the Working Face Based on the CF-TOPSIS Method

Table 1

Evaluation criterion system of rock burst grade.

Evaluating indicators	Weak	Mid	Strong	8003 working face
The same level of coal seam rock burst history times (times)	1	2	3	2
Mining depth h (m)	400	600	800	647
The distance d between the hard thick strata and the coal seam in the overlying fracture zone	100	50	20	15.85
Ratio of stress increment to normal stress in the mining area (%)	10	20	30	17.3
Uniaxial pressure resistance (MPa)	10	14	20	10.3
Elasticity index	2	3.5	5	1.58
Relationship between the working face and adjacent goaf	1 side goaf	2 side goaf	3 side goaf	1 side goaf
Working face length (m)	300	150	100	290
Section coal pillar width (m)	3	6	10	48
Bottom coal thickness (m)	0	1	2	0