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KMID : 0895420030130020107
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Journal of Korean Society of Occupational and Enviromental Hygiene
2003 Volume.13 No. 2 p.107 ~ p.112
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The Size Characteristic of Particles generated during Road Tunnel Construction Work
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류장진/Ryoo, Jang-Jin
장재길/이병규/정시정/김성진/김광종/Jang, Jae-Gil/Lee, Byung-Kyu/Jung, Si-Jung/Kim, Sung-Jin/Kim, Kwang-Jong
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Abstract
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In tunnel construction work. major dust-generating activities are blasting rock, rock drilling and transport operations. The aim of this study was to find the characterisitic of particle size of dusts which were generated during road tunnel construction work using the New Austrian Tunneling Method(NATM). An 8-stage personal cascade impactor was used for particle size-selective sampling by area sampilng method. Paired samples for total(closed-face 37-mm cassette holder)and respirable(10 mm nylon cyclone) dust were taken to compare with the results of cascade impactor at the same location where cascade impactor samples were taken, The geometric mean of mass median aerodynamic diameter(MMAD) of dust is 3.9(GSD=4.3). This is quite similar to 50% cut size(4.0 ) for respirable mass fraction defined in the ACGIH TLV. The mass fraction of inhalable, thoracic, and respirable particulate defined at ACGIH TLV are 84.0%, 67.2% and 43.1%, respectively. The arithmetic mean ratio of inhalable particulate mass to respirable particulate mass is 2.04 for paired sample, 1.95 for cascade impamtor sample, which showed much lower than those of other construction tasks. We conclude that the dust generated during road tunnel excavation has about 50% respirable fraction in inhalable particulate mass.
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