Abstract:

In order to improve the durability of the construction machine and the working environment in deep buried tunnels, based on the theory of gas-solid two-phase flow, CO and dust were selected as the main objects of study, and a physical model of deep buried tunnels was established by Fluent software. The effects of different surrounding rock temperatures and the outlet speed of the wind pipe on the transport process of soot in deep tunnels were investigated through simulation. The results show that after blasting, CO is uniformly distributed in the throwing area. With the increase of ventilation time, the CO transport shows two modes of translation and diffusion. CO is discharged out of the tunnel in the form of a mass, and the CO transport speed at the tunnel wall is larger than that at the center of the tunnel. At the moment of blasting, a large amount of dust gathers near the working face, and with the increase of ventilation time, the dust is continuously discharged out of the tunnel. Among them, the temperature of the surrounding rock has a certain effect on the transportation of CO. The higher the temperature of the surrounding rock, the faster the transportation of CO. However, the effect of the surrounding rock temperature on the transportation of dust is relatively small. The outlet speed of the wind pipe has a greater impact on the transportation of CO and dust. The greater the outlet speed of the wind pipe, the faster the transportation of CO and dust. The field application should be combined with the actual conditions and economic budget to select the relevant equipment.

Key words: gas-solid two-phase flow, deep buried tunnels, smoke and dust transport, outlet speed of wind pipe, surrounding rock temperature