Study on Dust Dispersion during Construction of Wet Spraying in Tunneling Roadway

In order to study the dispersion rule of wet-spraying dust in excavation roadway under far-pressing-nearing-absorption, the discrete phase model in Fluent software was applied to simulate the dust production in the initial spray of wet spraying, dust production as spray construction and drill break the rock at the same time, the dispersion law of dust in roadway was obtained. Research results show that the dust concentration of the press air side initial spray is higher than the air pumping side initial spray, and it is particularly obvious near the end of the excavation roadway; when the press air side or air pumping side multiple spray and drill breaks the rock at the same time, the change rule of dust mass concentration is first reduced along the exit direction of the roadway, then increased due to multiple spray produces dust, and then decreased again. According to the rules of dust dispersion, some suggestions are made to reduce the damage of dust to workers.