TEST EXECUTION OF SHOTCRETE TO REDUCE DUST IN TUNNEL EXCAVATION

Abstract

The “Guideline for the measures against dust generated in tunnel construction” decided by the Ministry of Health, Labour and Welfare in December 2000 shows control measures at generation source, target level of the dust concentrarion as 3mg/m³.
To investigate effective means to reduce generating dust, dust reducing agent and slurried accelerator were applied to the tunnel under construction and some tests were carried out. In result, both means were effective to reduce the amount of generating dust.