Study on the Mechanical Relationship among the Backfilling Mining Support, Roof Rock Beam, and Gangue Filling Body in Comprehensive Mechanized Filling Mining Process

Table 4

Similar model experiment scheme and combination design of foam and sponge for two models.

	Actual mining height (m)	Actual initial filling height (m)	Height of high density foam (cm)	Height of sponge (cm)	Combined height after initial compression (cm)
ModelI	3.0	1.8	5.45	5.65	6.67
ModelII	3.0	2.85	8.64	2.46	10.56