Characteristics of Valuable Microseismic Events in Heading Face of an Underground Coal Mine Using Microseismic System

<table class="table-group" id="tab1"><tr><td><table class="table"><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr class="thead"><td class="align_left">Parameter</td><td class="align_center">Parameter description</td></tr><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr><td class="align_left">Number of channels supported</td><td class="align_center">Max of 12 (4 used in 117 track gateway)</td></tr><tr><td class="align_left">Installation position</td><td class="align_center">Underground</td></tr><tr><td class="align_left">Sampling frequency</td><td class="align_center">Max of 10 kHz (2 kHz used in 117 track gateway)</td></tr><tr><td class="align_left">Synchronization time error of each channel</td><td class="align_center">Less than 10<sup>−6</sup> s</td></tr><tr><td class="align_left">Safety level</td><td class="align_center">IP 54 (China)</td></tr><tr><td class="align_left">Explosion proof grade</td><td class="align_center">Exd I (China)</td></tr><tr><td class="align_left">Connection mode</td><td class="align_center">Two core cable connection</td></tr><tr><td class="align_left" rowspan="2">Executive standards</td><td class="align_center">GB3836.4-2000 (China);</td></tr><tr><td class="align_center">GB/T24260-2009 (China)</td></tr><tr class="table-tr"><td colspan="2"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Parameters of the acquisition instrument used in the MS system of 117 track gateway.</div>

Shock and Vibration

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Table 1

Table 1: Characteristics of Valuable Microseismic Events in Heading Face of an Underground Coal Mine Using Microseismic System 