Risk Prediction of Coal and Gas Outburst Based on Abnormal Gas Concentration in Blasting Driving Face

Figure 14

Evolution process of coal and gas outburst during coal roadway driving [40].

(a) Driving distance 0.2 m

(b) Driving distance 3.0 m

(c) Driving distance 3.4 m

(d) Driving distance 4.0 m