超大直径泥水盾构隧道施工通风设计方案研究  

Research on Ventilation Design for Construction of Super-large Diameter Slurry Shield Tunnel

作　　者：胡威东[1,2] HU Weidong(China Railway Siyuan Survey and Design Institute Group Co.,Ltd.,Wuhan 430063;National-Local Joint Engineering Research Center of Underwater Tunneling Technology,Wuhan 430063)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063 [2]水下隧道技术国家地方联合工程研究中心,武汉430063

出　　处：《现代隧道技术》2023年第5期186-194,共9页Modern Tunnelling Technology

摘　　要：以某大直径泥水盾构隧道施工通风方案设计为例,采用ANSYS Fluent计算流体力学软件仿真分析隧道施工通风效果,通过实地测量验证了数值仿真模型计算结果的准确性,总结了通风状态下流场分布及风流运动规律,并对比研究风管出口风速、风管直径、风管出口位置3种通风参数对隧道通风的影响,提出了通风参数的优化方案。结果表明:隧道通风流场的风速分布呈现回风侧风速整体大于进风侧风速、隧道上部风速整体低于下部风速的特点;增大风管出口风速对改善隧道施工通风效果最为显著;采用优化方案后的隧道中心平均风速可提高约59.3%,各工作区域空气流速均达到0.15 m/s以上的施工通风标准,可经济高效地改善隧道盾构段工作区域通风效果。In this study,based on the ventilation design of a large diameter slurry shield tunnel under construction,the computational fluid dynamics software(ANSYS Fluent)is used to simulate and analyze the ventilation effect of tunnel construction.The accuracy of calculation results of the numerical simulation model is verified through onsite measurements,and the flow field distribution and the airflow movement law under ventilation conditions are summarized.A comparative study is conducted on the influence of three different ventilation parameters such as wind speed at the air duct outlet,air duct diameter,and position of air duct outlet,and an optimization plan for venti⁃lation parameters is proposed.The results show that the wind speed distribution in the ventilation flow field of the tunnel exhibits the following characteristics:the wind speed on the return air side is generally larger than that on the inlet air side,and the wind speed on the upper part of the tunnel is generally less than that on the lower part.Increasing the wind speed at the outlet of the air duct is the most significant in improving the ventilation effect of tunnel con⁃struction;After adopting the optimized plan,the average wind speed at the tunnel center can be increased by about 59.3%,and the velocity of airflow in each working area can reach the construction ventilation standard of 0.15 m/s or above,which can economically and efficiently improve the ventilation effect in the working area of the shield sec⁃tion of the tunnel.

关 键 词：泥水盾构 施工通风 数值模拟 通风流场 运动规律 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]