Study on Prediction of Outburst Risk of Excavation Face by Initial Gas Emission

Figure 2

Experimental device. 1—press machine; 2—pressure pole; 3—cylindrical block; 4—drill pipe; 5—coal seam; 6—stopper; 7—large flow sensor; 8—small flow sensor; 9—coal bunker; 10—electric coal drill; 11—displacement sensor; 12—flow tube.