Three-phase type tunnel construction ventilation control method

The invention provides a three-phase type tunnel construction ventilation control method. The method includes that automation control on tunnel construction ventilation is realized by adopting phase-type ventilation control, the first phase is a ventilation phase at full speed, and in other words, after completion of explosion, a fan enters the ventilation phase at full speed to blow dust and toxic gas generated from explosion out of working areas where personnel gather; the second phase is automatic adjustment phase, in other words, when peak values of the dust and toxic gas exceed a rack of a waterproof board, the fan enters the automatic adjustment phase, and running frequency of the fan is adjusted gradually to lowest wind speed meeting required wind quantity of a site by adopting a fuzzy neural network algorithm; the third phase is a lowest wind speed running phase till coming of next explosion. With the method, environmental conditions of tunnel faces can be improved rapidly with the ventilation phase a