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

<div>Comparison of the results of MWD and VMWD systems. (a) Cross-layer borehole No. 12. (b) In-seam borehole No. 22.</div>

Shock and Vibration

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Figure 20

Figure 20: Experimental Study on Comprehensive Real-Time Methods to Determine Geological Condition of Rock Mass along the Boreholes while Drilling in Underground Coal Mines 

Figure 20 | Experimental Study on Comprehensive Real-Time Methods to Determine Geological Condition of Rock Mass along the Boreholes while Drilling in Underground Coal Mines 