Analysis of the Dynamic Impact Mechanical Characteristics of Prestressed Saturated Fractured Coal and Rock

Table 1

Physicomechanical parameters of natural and water-saturated specimens under uniaxial compression.

Specimen number	State	RC (MPa)	(%)	(kg·m^−3)	E (GPa)
D1-1	Natural	43.11	—	1.33	2.11
D1-2	Natural	42.07	—	1.35	1.90
D1-3	Natural	42.92	—	1.34	1.94
D1-4	Saturated	25.30	3.2	1.37	1.73
D2-1	Saturated	20.81	6.1	1.45	1.28
D2-2	Saturated	20.4	4.5	1.36	1.66
A21	Natural	137.3	—	2.61	34.3
A22	Natural	129.5	—	2.606	32.6
A23	Natural	162.4	—	2.625	35.9
A214	Saturated	111.2	0.23	2.623	31.5
A215	Saturated	130.0	0.77	2.608	36.4
A216	Saturated	97.7	0.40	2.603	29.5