Failure and Acoustic Emissions of Coal–Rock Combinations with Different Dip Angles in the Shaqu No. 1 Coal Mine

Table 1

Mechanical parameters of the coal and rock samples.

Category	Number	Uniaxial compressive strength (MPa)	Modulus of elasticity (GPa)
Coal	1-1	22.12	2.69
	1-2	23.65	2.66
	1-3	21.96	2.71
Rock	2-1	43.43	22.77
	2-2	44.14	21.65
	2-3	42.90	23.40