CHINESE JOURNAL OF COMPUTATIONAL PHYSICS ›› 2012, Vol. 29 ›› Issue (2): 239-244.

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Mechanical Analysis of Radon Transport in Vicinity of an Underground Tunnel

NIU Guanyi, CHEN Jianjie, WANG Jun   

  1. Northwest Institute of Nuclear Technology, Xi'an 710024, China
  • Received:2011-04-27 Revised:2011-08-01 Online:2012-03-25 Published:2012-03-25

Abstract: A radial symmetrical model of radon transport in vicinity of an underground tunnel is developed with continuum mechanics theory.Distribution of radon concentration in the vicinity of tunnel is analyzed under the assumption that only diffusion and permeation are considered.Analytic solutions are obtained.A rock mass range affecting the radon concentration in the tunnel is defined as effective transport distance.Effective transport distance as functions of effective porosity and velocity are given.Expressions of radon exhalation rate on tunnel wall are shown.

Key words: radon, tunnel, exhalation rate, effective transport distance

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