Experimental Study on Comprehensive Real-Time Methods to Determine Geological Condition of Rock Mass along the Boreholes while Drilling in Underground Coal Mines

<table class="table-group" id="tab2"><tr><td><table class="table"><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr class="thead"><td class="align_left">Item</td><td class="align_center">Value</td></tr><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr><td class="align_left">Maximum range of acceleration sensor</td><td class="align_center">±16 g</td></tr><tr><td class="align_left">Resolution of acceleration sensor</td><td class="align_center">3.9 mg</td></tr><tr><td class="align_left">Sampling frequency</td><td class="align_center">3200 Hz</td></tr><tr><td class="align_left">Battery life per recharging cycle</td><td class="align_center">72 hours</td></tr><tr class="table-tr"><td colspan="2"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Main parameters of the VMWD system.</div>

Shock and Vibration

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Table 2

Table 2: Experimental Study on Comprehensive Real-Time Methods to Determine Geological Condition of Rock Mass along the Boreholes while Drilling in Underground Coal Mines 

Table 2 | Experimental Study on Comprehensive Real-Time Methods to Determine Geological Condition of Rock Mass along the Boreholes while Drilling in Underground Coal Mines 