Sensitivity Analysis and Numerical Simulation Study on Main Controlling Factors of Surface Movement and Deformation in Strip Filling Mining under Thick Unconsolidated Layers

Table 4

Factor level table.

Level	Factor
	Filling rate (%)	Filling body strength (MPa)	Key layer thickness (m)	Loose layer thickness (m)
1	51	2.0	40	160
2	60	3.0	70	200
3	69	4.0	100	240