Mechanical Behavior and Impact Resistance Tendency of Coal Mass with Different Water Content

Table 4

Performance indexes of coal samples with different water content.

Number	-1	-2	-3	-4	-5	-6	-7	-8
Moisture content (%)	5.4	3.4	4.4	3.4	4.4	2.4	5.4	2.4
Peak stress (MPa)	5.885	11.800	10.790	15.555	9.495	18.835	8.325	39.640
Effective impact energy index	5.9818	13.2882	8.3474	19.1614	2.3613	31.0125	16.452	6.1633
Residual energy index	4.98182	12.28822	7.34744	18.1614	1.36126	30.01247	15.452	5.1633