Stability Evaluation of the Goaf Based on Combination Weighting and Cloud Model

Table 14

Statistics of numerical simulation calculation of the stability of the goaf.

Number of goaf	Settlement of roof slab (cm)	Top plate tensile stress (Mpa)	Plastic zone distribution	Stability description
1525-1	2.76	0	Almost nothing	Ⅳ
1525-2	2.46	0	Almost nothing	Ⅳ
1525-3	2.57	0	Almost nothing	Ⅳ
1525-4	2.78	0.22	Small distribution	Ⅲ
1640-4	3.78	0.67	Large distribution area	II
1640-5	1.35	0	Almost nothing	Ⅳ
1640-6	1.26	0	Almost nothing	Ⅳ
1830-3	1.67	0	Small distribution	Ⅲ
1830-4	1.54	0	Small distribution	Ⅲ