竖井型自然通风公路隧道气流与污染物分布的影响因素研究

摘要

本文针对城市竖井型自然通风公路隧道,采用理论与实验相结合的手段,研究建立了全长隧道气流与污染物分布的数学模型.运用该模型,分类研究了不同竖井间距、竖井截面尺寸、交通量、车速和主体长度工况下,隧道内气流与污染物的分布状况.得出了在浅埋竖井型市政公路隧道的修建与运营过程中,降低主体长度与提高车速可有效改善污染物浓度的分布状况.%In this paper, for the urban road tunnels with shafts under natural ventilation condition, mathematical model for airflow and pollution distribution were set up, in which both theoretical and experimental methods were used. Based on this model, the statues of airflow and pollution distribution were studied under different shaft distants, shaft section sizes, traffic flows, vehicle velocities and main body lengths. It was concluded that during the construction and operation period for urban road tunnels with shallow bury and shafts, its pollution concentration distribution could be effectively improved by decreasing the main body length and increasing the vehicle velocity.