Figure 4 | Scientific Reports

Figure 4

From: Research on controlling gas overrun in a working face based on gob-side entry retaining by utilizing ventilation type “Y”

Figure 4

The Working Face’s Ventilation Network Diagram of the South Wu-1201. Figure 4 illustrates Working Face’s simplified ventilation network of the Nanwu 1201. V1 represents the junction point of the working face and the transportation roadway. V2 denotes the intersection point of the transportation roadway and the prevention roadway of the floor outburst. V3 represents the intersection point of the WF and the roadway of the return air. V4 represents the intersection point of the air return eye in the contact roadway of the 12th floor. Besides, the air leakage between the middle roadway track of the 12-layer and the roadway of the return contact is ignored.

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