Surrounding Rock Deformation Mechanism and Control Technology for Gob-Side Entry Retaining with Fully Mechanized Gangue Backfilling Mining: A Case Study

Table 2

Similar material ratios.

Relative position of rock	Rock type	Compressive strength (MPa)		Dry material composition (%)			Water content (%)	Sawdust (%)
		Prototype	Model	Sand	Lime	Plaster
Roof	Medium sandstone	120	1.44	30	9	61	14.3	/
	Siltstone	90	1.08	30	35	35	14.3	/
Coal seam	Coal	20	0.36	40	42	18	11.1	2
Floor	Mudstone	45	0.54	70	9	21	11.1	/
	Fine sandstone	85	1.02	30	35	35	14.3	/
RBB	Gangue concrete	8	0.096	80	10	10	11.1	/