青草沙输水隧道安全施工通风模型及湍流流动特性研究  

Study on models of construction ventilation and turbulent flow characteristics for Qing-cao-sha water tunnel

作　　者：丁珏[1] 李家骅[1] 吴冠南[1] 胡珉[1] 

机构地区：[1]上海大学上海市应用数学和力学研究所,上海200072

出　　处：《中国安全生产科学技术》2010年第2期26-32,共7页Journal of Safety Science and Technology

基　　金：上海隧道工程股份有限公司科技公关项目;国家自然科学基金项目(编号:10802046)资助

摘　　要：随着我国隧道总里程的迅速增加,隧道施工的通风问题日益突出。文中将着重分析上海市青草沙水源地原水工程7200m过江隧道施工的通风问题,即从流体力学的三维不可压缩雷诺时均Navier-stokes方程出发,基于RNGk-ε湍流模型及近壁区两层壁面模型,采用有限体积方法和SIMPLE算法,对隧道内湍流流动进行数值模拟。数值分析有害气体的分布情况,讨论正常施工、发生事故时不同通风量条件下,隧道盾构掘进工作面附近流场、温度及有害气体浓度的变化规律。得出:对于隧道施工中有害气体的连续泄漏事故,随着通风风量的增加,有害气体的浓度逐渐降低。对于有害气体瞬时泄漏的事故,当盾构机架通风管的通风量约为380.00m3/min,放置于机架中部附近的排风管压力为200Pa时,隧道施工的通风效果最佳。本文涉及的通风方式和有关的研究结果为保证隧道施工的安全性提供理论依据。With the rapid increase in the overall length of tunnel in China,construction ventilation of tunnel is increasingly prominent.The analysis of Shanghai Qing-cao-sha water tunnel projects of the ventilation problems was focused in this paper.Based on the Reynolds-averaged Navier-Stokes equations differentiated by the finite volume method,the 3-D turbulent flow of tunnel was simulated numerically with the RNG k-ε turbulent model and by the two-layer model for the near-wall region,then it was solved by SIMPLE scheme.The distribution of harmful gases was numerically analyzed,and different ventilation conditions,temperature and variation of the concentration of harmful gases were discussed.The computed results showed that the concentrations of harmful gases decreased as the ventilation air flow increasing for the continuous leakage accident of harmful gases.For the instantaneous leakage incident of harmful gases,when the ventilation of tube on the top of shield was 380.00m3/min,and the blowpipe pressure was 200Pa,tunnel construction ventilation is best,which provide a theoretical basis for ensuring the safety of tunnel construction.

关 键 词：隧道通风 NAVIER-STOKES方程 湍流模型 流动特性 

分 类 号：X962[环境科学与工程—安全科学]