Study on Filling Material Ratio and Filling Effect: Taking Coarse Fly Ash and Coal Gangue as the Main Filling Component

Table 2

Orthogonal test with 3 factors and 5 levels L₂₅(5⁶).

Level	Factor
	A	B	C
1	1 : 1	30	74
2	1 : 1.5	35	75
3	1 : 2	40	76
4	1 : 2.5	45	77
5	1 : 3	50	78