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

Table 6

Rock mass classification results of MWD and VMWD systems of in-seam borehole No. 22.

Rock classification	The Id value divides the result	The RMS value divides the result
Intact	0∼10 m	0∼10.2 m
Broken	10 m∼15.4 m	10.2 m∼15.1 m
Intact	15.4 m∼17.5 m	15.1 m∼17.3 m
Broken	17.5 m∼19.6 m	17.3 m∼20 m
Intact	19.6 m∼56 m	20 m∼56 m