Shock and Vibration / 2019 / Article / Tab 2

Research Article

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

Table 2

Features of the microseismic signal energy and event numbers.

Microseismic signal indicatorExcavation speed during the excavation operation

Energy per second of microseismic pulse during the excavation (mJ/s)10.8621.308.37
Event numbers per second during the excavation (1/s)17.1516.1419.73
Percentage of the total time required for the energy to reach 90% during excavation (%)54.782.687.6
Total energy during waiting time after excavation for a period of time (mJ)2.426.2553.34
Event numbers during waiting time27.053.0102.0
Energy per second during waiting time (mJ/s)0.0900.1180.523

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