Abstract
The method of mathematical modeling analyses influence of strong and very strong fire on ventilating systems of road tunnels with the purpose of an establishment of the period of their collapse and management of extreme situations. Models are executed for longitudinal ventilation system with using jet fans and for semi- cross-section sucking away system of airing which are adapted in Georgia. On models the temperature of a fire varied within the limits of 300-1000, and its thermal capacity - 30-100 MW. At temperature 1000 for semi-transverse exhaust ventilation system the period of approach of a collapse changes within the limits of 0.5-2.5 mines depending on thermal capacity of a fire. About the same size the longitudinal system of ventilation with application of jet fans is characterized also. From the point of view of management of emergency situations at strong and very strong fire any of the considered systems is not characterized by efficiency. In this case for rescue of a life and an infrastructure one of the basic methods is operative division of a tunnel into short sites by means of moved apart crosspieces who will interfere with uncontrolled distribution of toxic gases and superfluous heat in underground space.
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