Ground Subsidence Evolution from 1000 m Deep Mining: A Case Study in Fengfeng Mining Area

Table 3

Predicting parameters at different mining depths in Fengfeng mining area.

Category	Name of observatory	Mining depth (m)	Subsidence rate η	Horizontal displacement coefficient b	Tangent of main influence angle tanβ	Inflection migration coefficient S/H	Propagation angle of mining influence θ0 (°)
H ≤ 400 m	—	90∼400	0.78 (initial mining)	0.25	2.09	—	90–0.6α
400 m ＜ H ≤ 700 m	A-801	393∼426	0.66	0.35	—	—	82.7
	B-403, 407	477∼517	0.46	—	—	—	—
	C-102	600	0.20	0.29	—	—	89
	D-161, 164	540∼670	0.70	0.29	1.95	0.008	83.1
	E-226N	695	0.66	—	—	—	86.5
700 m ＜ H ≤ 1000 m	F-266	712∼790	0.26	0.27	1.96	0	88.1
	F-235	705∼816	0.32	—	1.84	0.020	89.9
	G-157	827∼930	0.19	0.28	1.70	0.025	81.3