Study on Catastrophe Instability of Support System in Gypsum Goaf Based on Energy Dissipation Theory

Table 1

Geometric dimension stability table of different classes of mining areas.

Class	Field parameters
	Pillar width (m)	Pillar height (m)	Width of the plastic zone (m)	Room span (m)	Roof thickness (m)	K
A	7.0	8.5	1.9	8.0	3.0	1.78
B	6.0	8.0	1.8	7.0	3.5	4.11
C	8.0	9.0	1.8	7.5	2.5	1.00
D	8.0	9.5	2.0	9.0	2.0	0.37