【摘要】 针对曲线隧道施工通风排尘问题，依托五阱明隧道工程，采用理论分析、数值计算和现场测试研究隧道曲率半径对喷浆粉尘迁移规律的影响。结果表明，不同曲率半径的隧道内喷浆粉尘具有相似的迁移轨迹，隧道沿里程粉尘浓度不断下降，隧道内喷浆粉尘迁移分为3个阶段：第1阶段为射流区，粉尘在区域内形成粉尘漩涡区；第2阶段为距掌子面20～50 m区域内，粉尘沿隧道壁螺旋外移，粉尘逐渐摆脱涡流区控制，粉尘分层明显；第3阶段为距掌子面50 m外区域，隧道内粉尘分层消失，分布平均。随隧道曲率半径减小，第1阶段粉尘迁移受沿里程阻力影响减弱，最大粉尘浓度区从隧道拱顶向隧道内侧移动，第2阶段长度不断缩短；隧道曲率半径对第3阶段粉尘迁移影响不明显。更多还原

【Abstract】 Aiming at the problem of ventilation and dust discharge in curved tunnel construction, relying on Wujingming tunnel project, the influence of tunnel curvature radius on the migration law of shotcrete dust was studied by theoretical analysis, numerical calculation and field test.The results show that the shotcrete dust in tunnels with different radius of curvature has similar migration trajectory, and the dust concentration in tunnels decreases continuously along the mileage.The shotcrete dust migration in tunnels can be divided into three stages: the first stage is the jet area, where the dust forms a dust vortex area.In the second stage, in the area from 20 m to 50 m away from the tunnel face, the dust spirals outward along the tunnel wall, and the dust gradually gets rid of the control of the vortex zone, and the dust stratification is obvious.The third stage is the area 50 m away from the tunnel face, and the dust in the tunnel disappears in layers and is evenly distributed.With the decrease of tunnel curvature radius, the dust migration in the first stage is weakened by the resistance along the mileage, and the maximum dust concentration area moves from the tunnel vault to the inner side of the tunnel, and the length in the second stage is shortened continuously.The influence of tunnel curvature radius on dust migration in the third stage is not obvious.更多还原