Analysis of the Control Effect and Parameter Optimisation of Urban Surface Deformation in Underground Coal Mining with Solid Backfilling

Table 4

Calibration of projected surface parameters for the Tangshan mine.

Item	Subsidence factor	Tangent of major effective angle	Offset distance of the inflection point	Horizontal movement coefficient	Mining impact propagation angle
Caving method	0.55–0.85	1.92–2.4	0	0.33	82
Backfilling method (experience)	0.85–0.89	1.62–2.20	0.05–0.240	0.33	82
Backfilling method (measured)	0.028	1.20	0	0.33	82
Backfilling method (simulated)	0.82	2.15	0	0.33	82