THE DETERMINATION OF THE MAIN COMPONENT OF THE DEPRESS JON OF NATURAL DRAFT FOR VEHICULAR TRAFFIC TUNNELS: Print version was published: Journa l"Energy". Tbilisi. 2005. No(3 6 ), p a rt 2

Abstract

The nature of grad P changes has been ascertained using numerical values of the barometric pressures and amplitudes at the reference points within the Pasanauri-Kazbegi section of Military-Georgian highway and on the eastern and western slopes of Surname range along the motorway. It is assumed that at similar slope elevations, the difference in pressure can be accounted for by dissimilarity of climatic zones. At the same time, the said dissimilarity is the main component of the natural draft of tunnel ventilation current. of Surami range, at conventionally taken elevations, the values of reduced pressures have been calculated, Based on the results obtained, employing "Excel" program, the natural draft dependence of the numerical value of the main component (ДР) has been ascertained. It has been established that the distribution of increments is of a normal nature. The most likely range for the marked points is 100-150 and ±30 Pa, respectively. The work is illustrated by three figures. Fig. l displays the grapb, of the change of pressure gradient following the results of observations within Pasanauri-Jvari section of Georgian-Military road and along the highway of eastern and western slopes of Surami range; Fig.2 displays the characteristic indicator of natural draft distribution within the Pasanauri-Kazbegi section of the main Caucasus range, while Fig. 3 shows the characteristic indicator of the distribution of the main component of natural draft depression over the slopes of Surami range along the highway. 111.3.