Some
Resultsand Considerations on Permeating Tests of Acidic Mine Water through Concrete Block by Umetaro YAMAGUCHI1, Akira TAKATA2 , Naoyuki FUJII3 , Kan-ichi SHIMOHASHI4 , Yoneji NISHIDA and Akira OHSHIO5In order to solve pollution problems occurred by acidic mine water , concrete plugs or seals are considered effective to block water flow through roadways, seal ore body and improve the properties of mine water .A ki nd of permeating tests, input method by pressurized acidic mine water , were applied to concrete blocks and cement mortar blocks. Pressurized water of 9 kg/cm2 intruded into these samples of 30 cm length until a certain depth during 1 week to 2 years.Relations between intrusion depth and test duration were examined theoretically and experimentally under the influences of physical properties of concrete, acidity and iron ion concentrate of water and so on . Complexity of the intrusion behavior caused by the complicated mechanism of wettability or permeability of dry concrete samples , was amplified by the reactions . of compound near concrete surface.
On November 9, 1963, during the afternoon shift change at the Miike coal mine, eight rail cars filled with coal broke free and fell 360 meters [1]. The impact ignited coal dust in the mine and set off two explosions, killing 20 people immediately and trapping nearly 1,400 other workers up to 450 meters below the surface and 8 kilometers from the mine entrance. The explosion damaged electrical and telephone lines, but the ventilation fan continued to operate and spread carbon monoxide throughout the mine [1].
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