小净距隧道洞口通风交叉污染的数值分析及工程处治措施  

Numerical Analysis and Countermeasures for Air Cross Pollution at the Outlets of Closely-spaced Tunnels

作　　者：李浩[1] 王新刚[1] 周恒[1] 常炳阳[1] 尤鸿波[2] 

机构地区：[1]江苏省交通规划设计院有限公司,南京210005 [2]西南交通大学土木工程学院,成都610031

出　　处：《现代隧道技术》2009年第6期58-63,共6页Modern Tunnelling Technology

摘　　要：在小净距隧道通风过程中,会出现排出的污染空气被吸入到邻近隧道中的交叉污染,严重影响隧道通风的性能和效率。文章以北固山隧道洞口段及隧道外空气域为分析对象,采用k-ε双方程紊流模型及组分传输方程组,借助Fluent软件,模拟不同速度自然风,针对现有洞口设计、洞口外设置中隔墙以及出口施做明洞3种情况,研究隧道洞口以外污染物扩散对邻近隧道的影响。研究表明:隧道洞口接一段距离的明洞,对缓解通风交叉污染效果是非常明显的。When longitudinal ventilation is conducted for two closely-spaced tunnels, the exhaust air from one tunnel will be absorbed into the another, so the cross pollution will occur and the ventilation will be greatly affected. The paper studied the outlet section and the outside atmosphere area of Beigushan tunnel. By adopting the k-ε two-equation turbulence model and Species Tansport Equation model, and by means of computational software Fluent, the influence of pollutant diffusion from one tunnel outlet to the close tunnel was numerically analyzed under three conditions： the present design; setting diaphragm wall; extending a section of cut-and-cover tunnel outside the portal. Results showed that the effect for relieving air cross pollution was outstanding by extending a section of cut-and-cover tunnel.

关 键 词：小净距隧道 隧道通风 交叉污染 数值研究 FLUENT 

分 类 号：U453.5[建筑科学—桥梁与隧道工程]