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

Table 1

Grouping of coal and rock specimens.

Moisture content/%	2.4	3.4	4.4	5.4
Test piece no.	-6, A-8	-2, -4	-5, -3	-1, -7
Humidification treatment time/h	0	17	33	69