Experimental Study on Overburden Deformation Evolution under Mining Effect Based on Fiber Bragg Grating Sensing Technology

Table 2

Main overburden stratum structure and physical parameters.

Strata	Compressive strength (MPa)	Tensile strength (MPa)	Elastic modulus (GPa)	Poisson’s ratio
Aeolian sand	11.6	0.23	12.0	0.30
Loess	15.3	0.29	20.4	0.31
Mudstone	20.5	0.12	23.5	0.34
Sandy mudstone	32.1	3.21	26.0	0.30
Medium sandstone	40.6	5.59	33.9	0.28
Fine sandstone	46.6	5.00	32.5	0.29
Siltstone	41.9	2.03	36.0	0.32
Coal seam	16.2	0.86	13.5	0.27