弧形底梯形渠道混凝土衬砌板下温度与气温间的关系研究

Study on the Relation between Air Temperature and the Soil Temperature under the Plate of Concrete Lining Trapezoidal Canal with Arc-bottom

基于弧形底梯形渠道混凝土板衬砌冻胀观测试验,分析讨论了气温对衬砌板下温度的影响及其两者间数量关系。研究结果表明:初冻期板下20 cm地温稳定通过0℃,冻结期及融化期内板下20 cm处地温始终小于日平均气温;冻结期内负积温是影响板下温度的最关键因素;大气与土壤间的热量交换值在初冻期、冻结期、融化期依次增大;负积温与板下地温及冻深间均很好地符合二次多项式相关关系。

Based on the observation of frost heave nal with arc-bottom, the effect of air temperature on test of the concrete lining in trapezoidal cathe soil temperature under the plate of concrete lining in trapezoidal canal with arc-bottom and the quantitative relation between the two temperatures were analyzed and discussed. The results show that the soil temperature at 20 crn deep under the plate was stably above 0℃ in early freeze period and below the daily average temperature during the freeze period and melting period. The negative accumulated temperature during the freeze period is the most critical impact factor of the temperature under the plate. The value of air-soil heat exchange in the early freeze period, freezing and thawing periods increased gradually. Negative accumulated temperature and soil temperature under the plate were well related to freezing depth by 2nd polynomial correlation.