Optical Fiber Frequency Shift Characterization of Overburden Deformation in Short-Distance Coal Seam Mining

Table 1

Material ratios used in the similarity material model.

Lithology of simulated stratum	Stratum thickness (m)	Simulated thickness (cm)	Accumulated height (cm)	Material ratio	Dosage of analogous materials (kg)
					Sand	Gypsum	Mica powder
Loess	42.00	28.0	117.1	1019	238.25	2.38	21.44
Sandy mudstone	14.76	9.8	89.1	919	82.89	0.92	8.29
Siltstone	21.55	14.4	79.3	837	119.53	4.48	10.46
Medium-grained sandstone	28.75	19.2	64.9	837	159.47	5.98	13.95
Siltstone	6.70	4.5	45.8	937	37.63	1.25	2.93
Medium-grained sandstone	9.96	6.6	41.3	828	55.24	1.38	5.52
1^-2 coal seam	1.89	1.3	34.7		5.13	0.19	1.28
Fine-grained sandstone	9.4	6.3	33.4	937	52.34	1.89	4.42
Siltstone	3.80	2.5	27.1	828	21.08	0.53	2.11
Fine-grained sandstone	5.90	3.9	24.6	837	32.73	1.23	2.86
Siltstone	1.00	0.7	20.7	937	5.62	0.19	0.44
Fine-grained sandstone	12.16	8.7	20.0	828	73.14	1.8	7.18
2^-2 coal seam	4.60	3.1	11.2		12.48	0.47	3.12
Siltstone	3.54	2.4	8.2	937	19.88	0.66	1.55
Fine-grained sandstone	8.70	5.8	5.8	837	48.26	1.81	4.22