In this paper have been considered the semi-transverse and transverse scheme of system of ventilation for two-way traffic for single tunnel. In same time have been investigated the expected phases of emergencies caused by influence of fire. For conditions of Rikoti road tunnel have been determined that there is accumulation of deviations from the normal course of natural and anthropogenic processes. Measure for the prevention of hazards in tunnel is proposed the establishing a schedule for dangerous goods, when ventilation becomes important, because for saving lives is the need to remove smoke and toxic materials. To design the ventilation system, it is important to establish its functional capabilities for disaster management, both in the initial stage of the fire, and when it is in full development. As is well known, each emergency is characterized by its own rate of development. Emergency same situation due to the presence of fire is a rapidly developing phenomenon. On the scale of the fire situation is within the object. Consequently, the main results of this work are relevant to the management of the tunnel and the corresponding service of Emergency Management for the implementation of adequate measures to save lives.

In this article presented an analysis of the hazards caused by the influence of strong fires in the road tunnels. Have been considered the main factors that affect the reliability of the results of definition of the period of time during which there is the possibility of evacuation of people. The dependence of the period of time marked by the characteristic parameters of fire: from the power of spatial localization and duration of the ascending phase of its development. The paper noted that the duration of the evacuation period, will be less than the duration of the ascending phase of development of a fire and also noted that this period tends to narrowing due to the influence of turbulent diffusion fluxes. In this paper it is assumed that the turbulent diffusion fluxes occur between the zones in which the ruling are toxic carbon gases of fire and fresh ventilation air flow.