小直径泥水盾构隧道施工通风散热数值模拟  

A numerical simulation mode on the construction ventilation and thermos dispersion in the small diameter slurry shield tunnel

作　　者：夏毅敏 张玉敏[1,2] 吴遁 李军武[3] 肖雪萌[2] XIA Yi-min;ZHANG Yu-min;WU Dun;LI Jun-wu;XIAO Xue-meng(Light Alloy Research Institute,Central South University,Changsha 410083,China;State Key Laboratory of High Performance Complex Manufacturing,Central South University,Changsha 410083,China;China Railway 14th Bureau Group of the Tunnel Engineering Co.,Ltd.,Jinan 250013,China)

机构地区：[1]中南大学轻合金研究院,长沙410083 [2]中南大学高性能复杂制造国家重点实验室,长沙410083 [3]中铁十四局隧道工程有限公司,济南250013

出　　处：《安全与环境学报》2021年第4期1474-1482,共9页Journal of Safety and Environment

基　　金：湖南省科技重大专项(2019GK1010);江西省重点研发计划项目(S2017ZPYFE0146)。

摘　　要：在小直径泥水盾构隧道中,机电液设备数量众多且布置密集,盾构机掘进过程中产生大量热量,极易使有限的隧道空间内环境温度迅速升高。为改善小直径盾构隧道内通风环境,保障施工人员的健康安全及设备的正常运行,通过数值模拟方法研究了某小直径泥水盾构隧道内盾构施工区域通风流场及温度场分布规律,并通过现场测试数据验证了模拟结果的准确性,引入通风制冷系统对原压入式通风方案进行优化改进,并研究了优化后通风系统的温度控制效果。结果表明:在隧道施工过程中,原压入式通风方案下后配套拖车设备侧存在高温流动死区,不利于设备的通风散热;当通风风管出口风速达20 m/s以上时,可将盾构施工区域空气流速提高至0.2 m/s以上,能有效减少隧道内流动死区体积,但由于风管出口风温较高,局部高温区域仍然存在;采用通风制冷系统后,风管内通风气流得到冷却,隧道内空气环境温度能够降低至25℃以下,局部高温区域明显减少,可达到较好的通风散热效果。This paper is intended to make a numerical simulation for the high-temperature environment in the tunnel by using CFD software to analyze the construction ventilation effect and optimize the ventilation scheme,which provide theoretical basis for solving the problem of heat harm in the small diameter slurry shield tunnel.In this paper,the corresponding simulation model of tunnel construction ventilation has been established so as to examine the distribution characteristics of the flow velocity and temperature by taking the Yangtze River shield tunnel project as a case study sample.In addition,the validity of the simulation model is verified by the field measurement data.The ventilation and refrigeration system was introduced to optimize the forced ventilation scheme,and the temperature control effect of the optimized ventilation system was studied.The results show that during the tunneling process of slurry shield machine,the distance between the outlet of the ventilation duct and the front of the tunnel is within the effective range of the jet,and a low-speed vortex zone exists at the front of the tunnel.The high temperature flow dead zone exists on the side of the equipment in the trailer under the origin ventilation scheme,which is not conductive to the ventilation and heat dissipation of the equipment.When the flow velocity at the outlet of the ventilation duct exceeds 20 m/s,the flow velocity in the tunnel can be increased to above 0.2 m/s,which can effectively reduce the volume of the flow dead zone.However,due to the high temperature of the airflow at the outlet of the ventilation duct,local high temperature areas still exist near the heat source in the tunnel.After the ventilation and refrigeration system is adopted,the airflow in the ventilation duct is cooled.As a result,the temperature in the tunnel can be reduced to below 25℃and the high temperature area is significantly reduced,which can achieve better ventilation and heat dissipation effects.

关 键 词：安全工程 盾构隧道 通风环境 温度分布 数值模拟 

分 类 号：X962[环境科学与工程—安全科学]