Theoretical Research And Practical Application On The Ventilation Of Yangjiao Especial Long Tunnel

Along with the road profession unceasing development, the tunnel construction scale is more and more big, specially in recent years , many long and big tunnel constructed, requested in the tunnel to have to provide a system of ventilation which is perfect in the technology and reasonable in the economy , on the one hand satisfied under the normal operation situation in the tunnel the vehicles and the personnel security problem, on the other hand also guard againsted in the tunnel the fire had time the serious consequence which to the people brings.Along with the living standard of people unceasing enhancement, the request to the moderate of the driving in tunnel is also more and more high for the people, the scale of ventilation also unceasingly expands, simultaneously along with the level of the machine manufacture unceasing enhancement, like the level of the manufacture industry unceasing enhancement of the car, the bus and so on, the standard exhaust of the automobile (containing noxious gas) is also year by year reducing, it will request the tunnel established reasonable and the economical ventilated pattern. The correct choicing the pattern of ventilation, not only may save the expense of the construction and the mechanical device, but also may greatly reduce the ventilated expense of the later operationThis article mainly compares with several kinds of the pattern of ventilation through the Yangjiao tunnel (6.7 kilometers) , mainly studied below the research work:1. the theoretical calculation of Ventilation: Through the computation of four kinds of pattern of ventilation, complete lengthways ventilation mode in shoot type,ventilation mode of transportation and venting with inclined well,ventilation mode of transportation and venting with erect well, interflow ventilation mode with erect well,provided differently the theoretical calculation formula, the computation process and the computed result of the ventilaties pattern, provided the reference for the design research.2. the basic parameter value: The article accordings to project feasibility study and actual situation of the Huxiang road , made the full preparation to forecasts the volume of traffic, the composition of traffic vehicle type, the true speed of automobile movement, does the full proof. to CO, the density of smog, the value of the breath frequency, the value of the speed of wind of tunnel (containing slant hole) inside and delivers in the row of air flue3.the exhaust volume of automobile: the author of article calculated the amount of wind under the different operating mode of the tunnel separately pressed the exhaust volume of automobile is 1.0%, 1.5%, 2.0% of three kind of situations, produced the size of slant hole cross section, the wind speed of the slant holed under the different lapse-rate , carried on the comparing and gived the finally size of reasonable slant hole cross section.4. this article studied the expense of the construction and the later operation period under differently the pattern of ventilation in view of four kinds of differently the pattern ventilation, finally determined the reasonable ventilated pattern from comparing with the technology and the economy under differently the ventilated pattern .