MEMS Inertial Sensor for Strata Stability Monitoring in Underground Mining: An Experimental Study

Table 1

Mechanical properties of rocks near coal seam.

Stratum	Parameter
	Thickness; h (m)	Poisson’s; ratio; ()	Compressive; strength; (MPa)	Tensile; strength; (MPa)	Elastic; modulus; (GPa)	Density; (kg/m^3)
…	170	-	-	-	-	-
Gritstone	3.3	0.27	65	4.60	5.5	2580
Siltstone	2.6	0.30	72	7.50	9.0	2400
Sandy mudstone	3.1	0.25	26	1.80	3.5	2440
Mudstone	2.2	0.44	19	0.17	1.7	2660
Coal seam	3.6	0.26	14	0.06	1.2	1540
Mudstone	2.5	0.44	19	0.17	1.7	2660
…	-	-	-	-	-	-