多风井混合式通风矿井反风演习实践

为探究全矿反风风速对硐室火灾烟气蔓延的影响，利用FDS火灾数值模拟软件构建矿井巷道三维模型，模拟全矿反风风速为1.0、1.5、2.0、2.5 m/s条件下的火灾场景，分析不同反风风速下硐室左右两侧烟气浓度和巷道内能见度的变化情况。研究结果表明：当全矿反风风速为1.0 m/s时，巷道进风侧风流紊乱，烟气出现明显回流现象；随着反风风速的增大，进风侧风流方向开始反转，巷道内能见度和风流反向速率不断增大；反风风速为1.5~2.0 m/s较合适，且当针对硐室火灾事故采取救灾救援措施时，反风风速需确保大于临界风速2.5 m/s。

A study on long tunnel smoke extraction strategies by numerical simulation

In order to explore the effect of whole mineral anti-reversing speed on the spread of chamber fire smoke, the 3D model of roadway was constructed by using FDS fire numerical simulation software, the fire scenes under four conditions were simulated, that was, when the whole mineral anti-reversing speed was 1.0 m/s, 1.5 m/s, 2.0 m/s and 2.5 m/s respectively. Comparing the changes of smoke concentration on both left and right side of the chamber and the visibility in the tunnel under different air-reversing speeds. The results show that when the whole mineral anti-reversing speed is 1.0 m/s, the wind flow on the inlet side of the tunnel is in disorder, and the smoke has obvious recirculation flow; with the increase of the air-reversing speed, the direction of wind flow on the inlet side begin to reverse, and the visibility in the tunnel and the air-reversing speed continue to increase; it is suitable when the air-reversing speed is 1.5 m/s to 2.0 m/s, and when taking rescue measures for the chamber fire accident, the air-reversing speed should be ensured to be greater than the critical wind speed of 2.5 m/s.