摘要
为了快速处理隧道爆破施工后的粉尘及有害气体,文章以轿顶隧道为依托,采用现场测试方法进行研究,首先得出了距掌子面不同距离处7个特征点的粉尘、CO初始浓度的分布情况;其次研究了在纵向通风条件下,隧道内粉尘、CO浓度的变化规律;然后提出了水袋降尘技术方案、移动式喷雾除尘技术方案,并通过现场测试验证两种方案的降尘效果。研究表明:(1)爆破施工后距掌子面50 m位置处的粉尘、CO浓度均值分别为容许浓度的8.2倍、26.05倍;(2)在纵向通风条件下,前10 min内是粉尘、CO浓度下降最为快速的阶段,降幅均可达到50%;(3)水袋降尘技术方案的降尘效果明显,粉尘、CO浓度的最大降幅分别可达52.62%、43.91%;(4)移动式喷雾降尘方案的除尘效果优于水袋降尘方案,且前20 min是粉尘、CO浓度下降最为快速的阶段,降幅可达60%。
In order to quickly deal with the dust and harmful gas after tunnel blasting,based on the Jiaoding tunnel project,this paper conducts a field test to get the distribution of the initial concentrations of dust and CO at seven characteristic points at different positions away from the tunnel face;and then it studies the variation pattern of dust and CO concentration in the tunnel under longitudinal ventilation conditions;furthermore it proposes the technical solutions of dust reduction and removal with water bag and mobile spray respectively and verifies the superiority of the two solutions through field tests.The study shows that:(1)the average concentration values of dust and CO at 50 m away from the tunnel face after blasting are 8.2 times and 26.05 times of the allowable concentration,respectively;(2)under the condition of longitudinal ventilation,the first 10 mins is the stage where the dust and CO concentrations fall the most rapidly,with the rate of reduction reaching 50%;(3)the dust reduction effect of the water bag is significant,and the maximum reduction of dust and CO concentration can reach 52.62%and 43.91%respectively;(4)the dust removal effect of the mobile spray is better than that of the water bag,and the first 20 mins is the stage of the most rapid reduction of dust and CO concentration,and the reduction rate can reach 60%.
作者
王飞
王庆
焦卫宁
覃维
WANG Fei;WANG Qing;JIAO Weining;Qin Wei(Xi′an Highway Research Institute Co.,Ltd.,Xi′an 710065;CCCC Second Highway Engineering Co.,Ltd.,Xi′an 710065;Central South Survey Design Institute Group Co.,Ltd.,Wuhan 430071)
出处
《现代隧道技术》
CSCD
北大核心
2021年第5期196-203,共8页
Modern Tunnelling Technology
基金
中交第二公路工程局科技研发项目(2017-2-28)。
关键词
隧道工程
钻爆施工
水袋降尘
喷雾降尘
现场测试
Tunnel engineering
Drilling and blasting
Dust reduction with water bag
Dust reduction with mist spray
Field test
