道路热力融雪速率的试验测定及融雪过程动态特性

EXPERIMENTAL RESEARCH OF SNOW-MELTING RATE AND DYNAMIC CHARACTERISTIC OF SNOW-MELTING PROCESS ON HEATED PAVEMENT SURFACES

在寒冷冬季,西北高寒地区存在着降雪多且大、道路长期积冰(雪)等严重影响交通运输和经济发展的不利因素,如何高效、快速、环保地解决道路积冰(雪)的融化问题成为道路工程的研究热点。本文在自行搭建的道路热力融雪试验平台上,获得了道路热力融雪速率与表层温度的实验关联式,并建立热管-路基-积雪的道路实时融雪耦合仿真模型,通过对复杂结构形式及环境条件下,道路融雪系统的路面耦合传热规律的瞬态数值分析,获得了埋管深度、管道间距、加热温度、环境条件等对融雪总时间的影响规律,上述结论为高寒地区道路热力融雪的结构设计及热力优化提供了可靠的理论依据。

During the cold winter, there are unfavorable factors such as a large amount of snow and long-term ice on the road, which seriously affect the traffic and transport as well as the economy development in the northwest region. Therefore, it has become a research focus of road engineering that how to solve the problem of the snow and ice on the road efficiently, rapidly and environmental-friendly. In this paper, the experimental correlation formula of snow-melting rate and surface temperatures was investigated thoroughly in a self-built test rig of thermal snow-melting system. Meanwhile, the ＂thermal pipe - subgrade - snow＂ coupling model was developed to study the lag snow-melting mechanism. By means of the transient numerical analysis of the heat transfer law under complex structural type and ambient condition, the influence of the pipe depth, pipe spacing, heating temperature and ambient temperature on the total snow-melting time during the complex snow-melting process was shown and discussed. The results could be considered as basic references for the design and optimization of the thermal snow-melting system.