岩溶地区长大隧道施工通风模拟与空气净化技术研究

从隧道的发展趋势看,实现工程全局的高速和高效益必须依靠高度机械化的长距离独头掘进来实现,研究高性能施工设备及配套技术和施工管理技术自然成为至关重要。以贵广铁路斗篷山隧道工程为依托,对压入式通风过程进行了模拟,得到了CO及粉尘分布规律,并介绍了干式除尘空气净化技术。研究结果表明,通风10分钟后隧道工作区域的CO浓度已降至安全浓度(24ppm)以下,粉尘浓度最大处为掘进工作面未被风筒风流直射的一侧;增设除尘机后的掌子面附近粉尘测试数据显示,除尘机开启120秒后,空气中的粉尘质量浓度由初始的75 mg/m3下降到3mg/m3,空气质量达到隧道施工环境标准。

Study on Simulation of Construction Ventilation at Long and Large Tunnel in Karst Area and the Air Purification Technology

From tunnel development, to realize high speed and high efficiency of the project, it is required to depend on highly mechanized long-distance blind heading, thus the study on high-performance construction equipment and the supporting technology, as well as the construction management technology, becomes crucial. This paper, depending on the Doupenshan Tunnel project on Guiyang-Guangzhou Railway, made the simulation of forced ventilation process, then found the distribution law of CO and dust and introduced the air purification technique of dry type dedusting. The study result shows that the CO concentration in the work area after ventilating for 10 min has been below the safe level (24 ppm), the place where the dust concentration is maximum is on the side of the tunneling face toward which the air in the tubes does not eject directly. When duster is added, the measurements of the dust close to the working face show that the mass quality of the dust in the air, after the duster is turned on for 120 s, is decreased from 75 mg/m3 initially to 3 mg/m3, demonstrating that the air quality has reached the environmental criterion for tunnel construction.