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Turbulent diffusion of contaminants from instantaneous sources in the heading faces of tunnels

  • Mine Aerodynamics
  • Published:
Soviet Mining Aims and scope

Summary

  1. 1.

    It has been found that, with the ventilation system functioning, the time dependence of the concentration of noxious impurities from instantaneous sources (for example, blasting) at any point of the mixing zone is an asymmetric bell-shaped curve which increases from zero to a maximum in some interval of time and then decreases to zero.

  2. 2.

    It has been established experimentally that the time displacement of the concentration-curve peak varies with the amount of air being fed, the distance between the feed pipe and the face, and the geometrical dimensions of the tunnel (working). Minimum displacement of this peak is observed withlSB/QH=47–60. The practical importance of this phenomenon is twofold: 1) the conditions under which this minimum is observed reduce the time required to free the face from noxious impurities; 2) the presence of the minimum greatly simplifies the calculation of the amount of air fed to the face. Eq. (10), which is complicated, is thus transformed to the simpler Eq. (14), which has a similar form to the Voronov-Voronin equation, if we do not allow for the effect of gas absorption.

  3. 3.

    The observed effect is obtained only when the distance between the end of the feed pipe and the plane of the face is equal to the jet range. Deviations from this location retard the removal of noxious gases from the face.

  4. 4.

    A method is proposed for aerodynamic calculations of the combined ventilation scheme for the heading face of a tunnel. The procedure is as follows: from Eq. (12) we find the reach of the feed pipe, which established the maximum permissible distance between the end of the feed pipe and the plane of the face; from (21) and (22) we determine the air flow rate required to remove contaminants from the whole gassy zone after blasting (the suction pipe); then, from (23) and (24) we calculate the flow rate of air from the feed pipe for degassing the mixing zone and removing the gases to the suction pipe (intake).

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Authors
  1. V. V. Skobunov
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Additional information

Scientific Research Institute of Transport Construction (TsNIIS), Moscow. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 98–107, July–August, 1967.

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Skobunov, V.V. Turbulent diffusion of contaminants from instantaneous sources in the heading faces of tunnels. Soviet Mining Science 3, 396–403 (1967). https://doi.org/10.1007/BF02497566

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  • DOI: https://doi.org/10.1007/BF02497566

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