Experimental Study on the Application of BOTDA in the Overlying Strata Deformation Monitoring Induced by Coal Mining

Table 1

Physical and mechanical parameters of coal and rock.

Lithology	Bulk (t/m^3)	Com (MPa)	Tens (MPa)	Elas (10^3 MPa)
Coal	0.95	16	0.6	3.5
Mudstone	1.97	50	1.2	5
Siltstone	1.7	45	4	28
Conglomerate	1.83	75	5.5	32
Fine sandstone	1.67	30	4	35