Evaluation of Rock Burst Propensity and Rock Burst Mechanism in Deep Phosphate Mines: A Case Study of Sujiapo Phosphate Mine, Hubei Province, China

Table 1

Table of results of physical and mechanical determination of rocks.

Location	Number	Density (g/cm^3)	Surrounding pressure (MPa)	Compressive strength (MPa)	Shear strength (MPa)	Poisson’s ratio	Cohesive force (MPa)	The angle of internal friction (°)
Ore sample	K-1	3.00	0	19.596	6.6821	0.300	4.42	47
	K-3	3.07	8	37.016	9.8945	0.221
	K-5	3.00	10	75.098	22.1984	0.286
Roof	D-2	2.83	0	148.858	22.6338	0.261	9.68	71
	D-5	2.84	8	164.436	26.8031	0.224
	D-3	2.82	10	188.630	29.4427	0.272
Floor	d-1	2.75	0	84.835	16.3890	0.32	10.41	64
	d-2	2.77	5	97.933	21.4473	0.23
	d-5	2.77	10	130.504	27.4853	0.12