摘要
针对重庆至黔江线隧道爆破粉尘污染严重的问题,采用CFD-DPM数学模型对隧道内风流粉尘运移规律进行了数值模拟,研制了高效抑尘材料并进行现场应用。结果表明:隧道内风速随着距离掌子面越远风速呈现指数型下降的趋势,在距离掌子面31.5 m处最大达1.64 m/s,呈现中部风速较低,近壁面位置风速较高的现象。在纵向面上整体上看顶部风速>下部>中部。随着时间的推移粉尘在风流的裹挟作用下逐渐向隧道口移动,在重力的作用下粉尘自动沉降,100 s时呼吸带粉尘达到最远沉降位置108.81 m,粉尘浓度达12 mg/m^(3),该部分呼吸性粉尘应进行针对性处理,降低粉尘危害。根据重庆至黔江线隧道粉尘的理化性质,特研制了高效抑尘材料。在重庆至黔江线应用后降尘效果明显,平均降尘率为76.9%,最高降尘率可达82.2%。
To solve the problem of serious blasting dust pollution in the tunnel from Chongqing to Qianjiang,the dust transport law of airflow in the tunnel is numerically simulated by using CFD-DPM mathematical model,and a high efficiency dust suppression material is developed for field application.The results show that the wind speed in the tunnel decreases exponentially with the distance from the face of the palm,and the maximum wind speed reaches 1.64 m/s at 31.5 m from the face of the palm,showing a lower wind speed in the middle and a higher wind speed near the wall.On the longitudinal plane as a whole,the wind speed at the top is greater than that at the lower part and greater than that at the middle part.With the passage of time,the dust gradually moves to the tunnel entrance under the action of airflow,and the dust settles automatically under the action of gravity.At 100 s,the dust in the breathing zone reaches the farthest settling position 108.81 m,and the dust concentration reaches 12 mg/m^(3).This part of the respirable dust should be dealt with pertinently to reduce the harm of dust.According to the physical and chemical properties of tunnel dust from Chongqing to Qianjiang,a high efficiency dust suppression material was developed.After application in Chongqing-Qianjiang line,the dust reduction effect is obvious,the average dust reduction rate is 76.9%,and the highest dust reduction rate can reach 82.2%.
作者
闫帅帅
李伟
YAN Shuai-shuai;LI Wei(China Railway Construction Yellow River Investment and Construction Co.,Ltd.,250000,Ji'nan,China;Shandong Branch of China Railway 18th Bureau Group Co.,Ltd.,250000,Ji'nan,China)
出处
《建筑技术》
2025年第5期627-630,共4页
Architecture Technology
关键词
隧道爆破粉尘
数值模拟
粉尘浓度运移规律
tunnel blasting dust
numerical simulation
dust concentration transport law
