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

<div>Curves of index <i>I</i><sub>d</sub> of different boreholes: (a) results of cross-layer borehole No. 11; (b) results of cross-layer borehole No. 12; (c) results of in-seam borehole No. 22.</div>

Shock and Vibration

fig11

Figure 11

Figure 11: Experimental Study on Comprehensive Real-Time Methods to Determine Geological Condition of Rock Mass along the Boreholes while Drilling in Underground Coal Mines 

Figure 11 | Experimental Study on Comprehensive Real-Time Methods to Determine Geological Condition of Rock Mass along the Boreholes while Drilling in Underground Coal Mines 