Study on Mechanism and Main Influencing Factors of Rockburst under Complex Conditions of Hard and Deep Overburden

Table 3

Test result of rockburst tendency of coal 8 roof and floor in Xinzhuang Coal Mine.

Type	Item
	Load (MPa)	Apparent density (kg·m^−3)	Elastic modulus (GPa)	Tensile strength (MPa)	Bending energy index (kJ)
Roof	0.078	2.548	7.584	2.460	4.277
Floor	0.288	2.585	10.047	3.343	48.253