Effect of Underground Coal Mining on Slope Morphology and Soil Erosion

Table 2

Effect of natural slope gradient on slope gradient and length caused by underground mining.

Natural gradient	Gradient variation (°)	Gradient after mining (°)	Length variation (m)	Length after mining (m)
0°	1.417	1.417	–0.419	150.154
5°	1.164	6.164	–0.044	150.529
10°	1.034	11.034	0.164	150.737
15°	0.908	15.908	0.354	150.927
20°	0.807	20.807	0.350	150.923
30°	0.583	30.583	0.524	151.097