摘要
基于Pimentel等人开展的“线性三管”冻结模型试验结果,对建立考虑渗流和相变潜热的水热耦合模型进行验证。通过所提出的耦合模型,计算并分析在不同地下水渗流速度、不同管间距及管径条件下的砂层中温度场分布和冻结壁的发展规律。计算结果表明:文中提出的水热耦合模型能够有效的模拟渗流作用下人工冻结壁发展规律;渗流导致冻结管上下游段温度发展差异显著,渗流速度越大,差异越显著;冻结壁交圈时间随渗流速度越大呈指数增加,当渗流速度增大到临界值时,由于热量平衡甚至不能出现冻结壁交圈的现象;此外,管径越大,管间距越小,则冻结壁交圈时间越短,发展越均匀。
Based on the results of the“linear three-pipe”freezing model test conducted by Pimentel et al,the establishment of a hydrothermal coupling model considering seepage and latent heat of phase transition is verified.Through the proposed coupling model,the temperature field distribution in the sand layer and the development law of the frozen wall are calculated and analyzed under the conditions of different groundwater seepage velocity,different pipe spacing and pipe diameter.The calculation results show that the hydrothermal coupling model proposed in this paper can effectively simulate the development law of artificial frozen wall under the action of seepage;seepage leads to a significant difference in temperature development between the upstream and downstream sections of the freezing pipe,and the greater the seepage velocity,the more significant the difference;with the increase of seepage velocity,it increases exponentially.When the seepage velocity increases to a critical value,the phenomenon of freezing wall crossing cannot even occur due to heat balance;in addition,the larger the pipe diameter and the smaller the pipe spacing,the longer the frozen wall crossing time the shorter,the more evenly the development.
作者
陈宏明
Chen Hongming(Chongqing Railway Group Co.,Ltd.,Chongqing 410700,China)
出处
《山西建筑》
2023年第6期90-94,共5页
Shanxi Architecture
关键词
人工冻结壁
水热耦合模型
渗流
artificial frozen wall
hydrothermal coupling model
seepage
