渗流作用下单圈管冻结温度场数值模拟

NUMERICAL SIMULATION ANALYSIS OF SEEPAGE EFFECT ON THE FREEZING TEMPERATURE FIELD OF SINGLE LOOP PIPE

通过采用COMSOL Multiphysics有限元分析软件,建立渗流作用下单圈管冻结的简化分析计算模型,定性的分析渗流作用对冻结温度场的重要影响。结果表明,地下水渗流作用会对冻结温度场产生很大的影响,表现为降温区范围缩小,冻土形状不规整,上游温度高于下游温度,冻结壁扩展速度降低,冻结壁交圈时间增加。当渗流速度增到一定程度时,过大的流速会导致冻结壁不能交圈。

By using COMSOL Multiphysics finite element analysis software,a simplified analysis and calculation model of freezing of single loop pipe under seepage is established,and the important influence of seepage on freezing temperature field is qualitatively analyzed.The results show that groundwater seepage has a great influence on the freezing temperature field,such as the range of cooling zone is narrowed,the shape of frozen soil is irregular,the upstream temperature is higher than the downstream temperature,the expansion speed of frozen wall decreases,and the closure time of frozen wall increases.Excessive flow velocity will lead to the freezing wall can not close,when the seepage velocity increases to a certain extent.