Shock and Vibration / 2019 / Article / Tab 1

Research Article

Experimental Study on Stress Evolution and Microseismic Signals under Vibration Conditions of Coal during Excavation and Subsequent Waiting Time

Table 1

Excavation load.

Stage and processExcavation footage (mm)Footage summed (mm)Excavation time (min)Excavation speed (mm/min)

First stage1010
Second stageFirst excavation152581.875
Second excavation154081.875
Third stageFirst excavation256583.125
Second excavation259083.125
Fourth stageFirst excavation3512584.375
Second excavation3516084.375

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