隧道施工洞口粉尘分布影响研究及防控措施

发布时间：2018-01-11 23:00

本文关键词：隧道施工洞口粉尘分布影响研究及防控措施　出处：《武汉大学学报(工学版)》2017年04期 　论文类型：期刊论文

【摘要】：研究景区附近隧道施工产生的粉尘对洞口周边影响及防控措施.依托黄龙景区某隧道现场施工,结合理论分析粉尘运动模式、现场实测数据和数值模拟等方法,探究隧道不同工序对洞口粉尘浓度变化和掌子面推进过程中洞口粉尘浓度演变影响.模拟隧道洞口粉尘扩散模型,对洞口粉尘浓度引起的压力以及洞口附近影响分布进行研究,结果表明:洞口排出的粉尘绝大多数为可吸入粉尘,对洞口周围造成影响较大;隧道施工不同工序对洞口粉尘排放浓度呈时间非线性变化,钻爆出渣和喷射混凝土时产生洞口浓度最大;数值模拟出洞口粉尘扩散模式,当掌子面达到800m距离后,排出的粉尘浓度大致趋于平稳.通过粒径分析发现洞口粉尘颗粒平均个数最多的粒径范围小于7×10~(-6)m,其在洞口出现的概率和频率随粒径范围的减小而逐渐增大.最后科学地设计隧道洞口粉尘防控系统,可为今后隧道施工洞口粉尘防治提供借鉴.
[Abstract]:The dust generated near the tunnel construction on scenic spots on the edge effect and prevention and control measures. Based on the Huanglong scenic spot site construction of a tunnel, combined with theoretical analysis of dust movement model, field data and numerical simulation methods, the effect of dust concentration on the evolution process on the different tunnel dust concentration changes and face to promote the process of tunnel simulation. Dust diffusion model is studied, and the influence caused by the pressure near the entrance of dust concentration distribution results indicate that the dust discharge hole for the vast majority of respirable dust, resulting in a greater impact on the surrounding tunnel construction; different processes of the dust emission concentration was nonlinear change, drill slag and shotcrete burst generated when the concentration of the largest; numerical simulation the dust diffusion model, when face up to 800m distance, dust discharged The concentration of roughly stabilized. Through particle size analysis showed that the average number of dust particles up to the range of particle size is less than 7 * 10~ (-6) m, reduce the probability and frequency of the hole with the particle size range is gradually increasing. Finally, a scientific design of tunnel dust prevention and control system, which can provide a reference for future tunnel the construction dust control.

【作者单位】：云南省交通规划设计研究院;西南交通大学交通隧道工程教育部重点实验室;
【基金】：交通运输部西部科技项目(编号:2013318J13340) 中央高校基本科研业务专项资金资助项目(编号:SWJTU11ZT33) 教育部创新团队发展计划资助项目(编号:IRT0955)
【分类号】：U455.4
【正文快照】： 中国是建设隧道最多、隧道技术发展最快的国家[1].经过大量数据调研,目前越来越多隧道建设于景区附近[2]和城市里,隧道施工过程会破坏风景区及其附近的生态环境[3],尤其是粉尘等有害气体给城市和景区带来负面的影响,间接造成经济的损失[4].如何减少隧道施工过程中产生的粉尘对

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