Surface Subsidence Control during Deep Backfill Coal Mining: A Case Study

Table 3

Surface deformation characteristics affected by mining depth.

Mining depth (m)	Surface subsidence (mm)	Horizontal movement (mm)		Horizontal deformation (mm/m)		Inclined deformation (mm/m)		Curvature (mm/m^2)		Zone of influence (km^2)
		South-north direction	East-west direction	South-north direction	East-west direction	South-north direction	East-west direction	South-north direction	East-west direction
300	867	221	223	2.0/−2.1	2.1/−2.6	3.8	3.8	0.04	0.05	1.4
500	675	209	218	1.1/−1.2	1.2/−1.8	2.2	2.3	0.01	0.02	2.52
700	558	200	203	0.8/−0.8	0.8/−1.3	1.5	1.5	0.01	0.01	4.2
900	486	193	189	0.6/−0.7	0.6/−0.9	1.1	1.1	<0.01	<0.01	5.5
1100	431	182	174	0.5/−0.8	0.4/−0.7	0.9	1.1	<0.01	<0.01	5.96