摘要
为解决由于隧道施工断面大、在开挖过程中产生的粉尘难以通过施工通风排除的问题,对秦岭天台山隧道(双向6车道)施工过程中钻孔、爆破、出渣、喷浆等不同工况下的隧道粉尘质量浓度进行现场实测,并根据现场实测结果,对隧道内各工况施工粉尘分布特性进行数值模拟研究,提出适合于大断面隧道施工的粉尘控制措施。现场测试结果表明,出渣和喷浆工况下,粉尘质量浓度超过规范要求数倍。通过数值模拟得到:1)靠近掌子面40m区域内粉尘质量浓度不稳定,下降趋势不明显;2)在布置风管时,风管末段至掌子面距离建议取为60~80m,以保证新鲜风以较大的喷射面抵达掌子面;3)建议采用附壁风筒降尘+车载除尘方案,除尘效率达95%,能有效处理隧道各区域粉尘,且对施工造成的影响小。
The dust produced during construction of large cross-section tunnel cannot be easily exhausted by construction ventilation.Hence,field monitoring is carried out on dust concentration under conditions of drilling,blasting,mucking, spraying,etc.;the dust distribution characteristics under different constructions are numerically simulated according to monitoring data;and the dust control measures for large cross-section tunnel construction are put forward.It is showed that the dust concentrations under mucking and spraying exceed limit much.It is concluded by numerical simulation that:(1) The dust concentration in the area 40 m close to the excavation face is unstable,the downward trend is not obvious.(2) In order to ensure that the fresh air arrives at the excavation face with a larger spray surface,the distance between duct pipe end to excavation face is recommended to be 60 to 80 m when arranging the ventilation pipes.(3) It is recommended to use the wall-hung wind pipe dust reduction + vehicle-carried dust removal scheme,whose dust removal efficiency can reach 95%,and which can effectively reduce the dust concentration in various areas of the tunnel,and has little impact on construction.
作者
宋斌
董长松
郭春
王欣
宋骏修
SONG Bin;DONG Changsong;GUO Chun;WANG Xin;SONG Junxiu(CCCC First Highway Consultants Co,.Ltd.,Xi′an 710065,Shaanxi,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,Sichuan,China;Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Chengdu 610031,Sichuan,China)
出处
《隧道建设（中英文）》
北大核心
2019年第A01期101-109,共9页
Tunnel Construction
基金
"十三五"国家重点研发计划(2016YFB1200401)
教育部科技产学合作协同育人项目(201801221005)
区域公共管理信息化研究中心资助项目(QGXH18-08)
四川省教育科研资助金项目(2018495)
成都哲学社会科学规划项目(2019R44,2018R49).
关键词
大断面隧道
施工粉尘
降尘除尘
数值模拟
large cross-section tunnel
construction dust
dust reduction and removal
numerical simulation
