关键词: 矿井通风　, 爆破化学反应　, 炮烟扩散　, 数值模拟

Abstract: In order to master the distribution characteristics and diffusion law of blast smoke concentration after roadway blasting,and optimize the ventilation and dust prevention design,taking the long heading roadway of a mine as the research ob ject,and based on the gas-solid two-phase flow theory,the CFD method was used to simulate the pressure,velocity,temperature and concentration distribution of Roadway after instantaneous blasting,and the results were compared with the field measured data.The research results show that:① The shock wave oscillates back and forth in the tunnel,and the pressure curve decays in a fluctuating manner with time.The instantaneous maximum pressure can reach 115 kPa,and the pressure wave in the tunnel only needs 25~30 s to propagate and dissipate to normal pressure.The pressure in the tunnel eventually shows a distribution of high in the upper part and low in the lower part.② The temperature inside the tunnel shows an overall trend of rising,falling, and tending to stabilize,with an instantaneous maximum temperature of 1 200 ℃ and a temperature drop rate of about 4~5 ℃/s.③ The volume fraction distribution of toxic gases in the tunnel is as follows:NO2 >CO>SO2 >NH3 .The volume fractions all show a characteristic of first increasing and then decreasing,moving forward closely to the tunnel arch,and reaching a stable average diffusion velocity of 4~6 m/s.④ It takes at least 35 minutes for the CO toxic gas in the excavation tunnel to reach a safe concentration.Installing exhaust or combined pressure-exhaust ventilation equipment on the sidewalls of the tunnel can ac celerate the dispersion of toxic gases.The study findings provide valuable insights for efficient prevention and control of toxic gases in single-entry underground excavation.