低温条件下城市供水管道冰冻荷载规律研究

Study on law of frost load on water supply pipeline at low temperature

介绍了冰冻深度及供水管道冰冻荷载的一种计算方法,对冰冻深度与土壤热力学特征和地表温度情况进行了敏感性分析,并基于冰冻深度的计算,以一维供水管道冰冻荷载简化模型为基础,分析了供水管道冰冻荷载的发展规律,得出了冰冻荷载的时空分布规律及与地表温度和土壤类型的关系。结果表明:供水管道冰冻荷载的大小与时间和空间都有关,冰冻荷载沿着深度先增大后减小,剖面上的最大冰冻荷载与时间呈现二次抛物线的关系,最大冰冻荷载对应的深度与时间则呈现三次多项式的关系;冰冻荷载的大小与地表温度有关,最大冰冻荷载及其对应的深度与地表年平均温度成线性负相关关系;粘性土的冰冻荷载整体大于砂土,但砂土的最大冰冻荷载对应的深度略深于粘性土。

In this paper,firstly,sensitivity analysis have been done about the frost depth and thermodynamic characteristics of soil as well as the surface temperature.Based on the frost depth calculation and the simplified model about frost load of one-dimensional water supply pipeline,the development law of frost load on water supply pipeline was analyzed,the time and space distribution regularity of the frost load and the relationship with the land surface temperature and soil type was obtained.The results showed that the frost load was connected to space and time,the size of the frost load along the depth first increases then decreases,the maximum frost load on the profile showed a parabola curve relation with the time,and the depth corresponding to the maximum frost load showed a three times polynomial relationship with time.The frost load was related to the surface temperature,and the maximum frost load and its corresponding depth are linearly and negatively correlated with the average annual surface temperature;The frost load of cohesive soil was larger than that of sandy soil,but the depth corresponds to maximum frost load of sandy soil was deeper than that of cohesive soil.