Study on Development Law of Mining-Induced Slope Fracture in Gully Mining Area

Table 1

Material ratio of selected typical strata.

Number	Strata	Height (cm)	Mean thickness (cm)	Material ratio
				Ratio number	Sand	Gypsum	White powder	Coal ash	Loess
1	Soil	100.0	83.0	Sand: soil (20 : 1)	9.14	—	—	—	0.45
2	Siltstone	17.0	3.0	837	8.53	0.32	0.75	—	—
3	Fine-sandstone	14.0	6.0	846	8.53	0.43	0.64	—	—
4	Siltstone	8.0	3.0	746	8.40	0.48	0.72	—	—
5	5-2 coal	5.0	2.5	20 : 1:5 : 20	4.17	0.21	1.04	4.17	—
6	Fine-sandstone	2.5	2.5	746	8.40	0.48	0.72	—	—