水雾包裹式隧道降尘技术试验研究

Test on Water Mist Wrapped Dust Reduction Technology for Tunnels

为了更快速有效地消除隧道爆破所产生的粉尘,该文提出“风筒水雾包裹式”与“车载水雾包裹式”两种喷雾降尘方案,并依托云南轿顶隧道进行现场试验。研究表明:对于“风筒水雾包裹式”除尘技术方案,掌子面处1号特征位置在降尘10 min后,粉尘浓度下降至3.87 mg/m^(3),满足规范要求;针对“车载水雾包裹式”的降尘技术,相比于无降尘初始状态,前20 min粉尘浓度下降最快,1、2、3号特征位置处粉尘浓度20 min后的降幅分别为70.6%、61.1%及89.9%。风筒、车载水雾包裹式技术均可达到相应的降尘效果,后者降尘效果更为明显。

In order to eliminate the dust produced by tunnel blasting more quickly and effectively,two kinds of mist spray and dust reduction schemes were put forward,which were the“air duct water mist wrapped type”and the“vehicle-mounted water mist wrapped type”.The field test was carried out on Jiaoding Tunnel in Yunnan.The results show that for the dust reduction technology scheme of“air duct water mist wrapped type”,the dust concentration of the No.1 characteristic position at the tunnel face decreases to 3.87 mg/m^(3)after 10 minutes of dust reduction,which meets the specification requirements.For the dust reduction technology of“vehicle-mounted water mist wrapped type”,compared with the initial state without dust reduction,the dust concentration decreases the fastest in the first 20 minutes,and the decreasing amplitude of the dust concentration in the characteristic positions of No.1,No.2,and No.3 after 20 minutes are 70.6%,61.1%,and 89.9%,respectively.Both air duct and vehicle-mounted water mist wrapping technology can achieve corresponding dust reduction effects,with the latter having a more significant effect.