| There is blasting fume in the tunnel blasting operation. If the human body absorb hazardous substances such as carbon monoxide, dust and other substances contained in the blasting fume for a long time or too much, it will be hazardous to health. In order to make the concentration of the toxic substances to achieve the standard,we need to ventilate in the tunnel. In the blasting process, workers need to do detonated work in a place which is closed to the tunnel face and they can not leave the place in a short time. Study on the Blasting fume’s diffusion in space and time with ventilation and making a reasonable arrangement for time and place of the work will protect workers from poison. The main contents are as followed:(1)Analyze the regularity of the dust particle diffusion after the tunnel blasting with theory and calculate the shortest time of the exhausting of the smoke after the blasting of pingdingshan tunnel according to the traditional experimental equation.(2)Through the measurement of the concentration of CO and PM2.5 after the blasting of pingdingshan tunnel, we analyze the data and get the regularity of the smoke diffusion with time on three sections and put forward some countermeasures for the improvement of the environment.(3)With the actual conditions and the of measurement the pingdingshan tunnel, we simulate the regularity of flow fields and the blasting fume under ventilation condition using gas-solid two phase flow theory and FLUENT software and change the boundary conditions to get a result which is closed to the measurement data to ensure the accuracy of the simulation.(4)Based on the past simulation, we change the air volume of the fan and the distance of the fan under a condition of adding exhaust fans and analyze the influence of these two factors on the diffusion of blasting fume. Comparing with simulation results, we found that the effect of the ventilation optimization is best when the distance between the exhaust fan and the pressure fan is small. |
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