管幕冻结法热流耦合温度场分布规律及敏感性研究  

Study on the Distribution Law and Sensitivity of Heat-Fluid Coupling Temperature Field of Pipe Curtain Freezing Method

作　　者：刘冰 LIU Bing(China Railway Construction Urban Transportation Development Co.Ltd.,Suzhou Jiangsu 215000,China)

机构地区：[1]中铁建城建交通发展有限公司,江苏苏州215000

出　　处：《铁道建筑技术》2024年第8期97-100,162,共5页Railway Construction Technology

基　　金：海南省科技厅重点研发计划高新技术项目(ZDYF2024GXJS001);海南大学横向科研项目(HD-KYH-2022405)。

摘　　要：为得到管幕冻土温度场在渗流作用下的变化规律及温度敏感性影响因素影响,运用有限元数值软件建立热流耦合模型,通过控制模型有无渗流作用条件和设置温度路径分析管幕冻结法温度场分布特征。结果表明:渗流作用下的冻土帷幕不均匀发展,下游一侧冻结范围大于上游一侧,整体厚度变薄;冻结管密集区域内的5号点冻结效果受渗流影响小于冻结管分散区域内的1号点,渗流能直接穿过的区域温差更大;比热容与导热系数的改变对1号点温度变化影响较大;当导热系数越大、比热容越小时,土体最终温度越低。In order to get the pipe curtain frozen soil temperature field under the seepage action change rule and temperature sensitivity influencing factors,a heat-fluid coupling model was established using finite element numerical software.The temperature field distribution characteristics of the pipe curtain freezing method was analyzed by controlling the presence or absence of seepage conditions in the model and setting temperature paths.The results show that under the action of seepage,the frozen soil curtain develops unevenly,with a larger freezing range on the downstream side compared to the upstream side,and the overall thickness decreases.The freezing effect at Point 5 in the densely freezing pipe area is less susceptible to seepage compared to Point 1 in the scattered freezing pipe area,and the temperature difference is more significant in the zones where seepage can directly penetrate.The changes in specific heat capacity and thermal conductivity have a more significant impact on the temperature variation at Point 1.As the thermal conductivity increases and the specific heat capacity decreases,the final temperature of the soil becomes lower.

关 键 词：渗流作用 水热耦合 管幕冻结 冻土帷幕 有限元模拟 

分 类 号：U455.49[建筑科学—桥梁与隧道工程]