Study on Roof-Coal Caving Characteristics with Complicated Structure by Fully Mechanized Caving Mining

Table 6

Experimental scheme for dissipation of top coal in coal seams with three soft and complex structures.

Horizon		Actual		Model
		Thickness (m)	Block degree (mm)	Thickness (cm)	Block degree (mm)
Top coal	Bottom	1.15	125	4.6	5
	Middle-bottom	2.3	437.5	9.2	17.5
	Middle	1.85	187.5	7.4	7.5
	Middle-top	2.5	500	10	20
	Top	1.7	250	6.8	10
Basic roof	Bottom	1.3	300	5.2	12.5
	Top	1.3	375	5.2	15
Basic roof	Bottom	3.637	1000	14.5	40