Quantitative Calculation of Critical Depth in Typical Rockburst Mine

Table 1

Physical mechanical parameter characters of coal and rock in one coal mine.

Lithology	Natural apparent density (kg.m^−3)	Uniaxial compressive strength (MPa)	Uniaxial tensile strength (MPa)	Modulus of elasticity (MPa)	Poisson ratio
Rock A	2189	5.5	1.01	1170	0.24
Coal	1243	15.3	2.71	6330	0.29
Rock B	2712	40.1	4.60	44768	0.22
Rock C	2552	23.0	1.52	17885	0.18