高寒地区输水渠道防冻优化设计研究

Study on Optimal Design of Frost Protection of Water Delivery Channel in Alpine Area

为优化高寒地区输水渠道防冻设计,在渠道衬砌内布置聚氨酯保温层,厚度分别为:0、2 cm、4 cm、6 cm、8 cm、10 cm 6种工况,从土体含水率、土体温度、冻结深度和冻胀量进行分析,结果表明,随着保温层厚度的增加,土体的温度逐渐升高,保温板对土体温度的提升效果越好,最大冻结深度和最大冻胀量均越来越小;保温层厚度为2 cm、4 cm、6 cm、8 cm、10 cm时对冻结深度和冻胀量的消减率分别为:52%、93.6%、100%、100%、100%和44.9%、94.2%、100%、100%、100%。多方面综合考虑,认为保温层厚度选择6 cm为最佳方式。

In order to optimize the antifreeze design of water conveyance channels in high and cold regions, the thickness of polyurethane insulation layers in the channel lining are: 0cm, 2cm, 4cm, 6cm, 8cm, and 10cm. After analyzing the freezing depth and frost heave, the conclusions are as follows: As the thickness of the insulation layer increases, the temperature of the soil gradually increases, and the better the effect of the insulation board on the soil temperature, the greater the maximum freezing depth and the maximum frost All are getting smaller and smaller;the reduction rates of freezing depth and frost heave when the insulation thickness is 2cm, 4cm, 6cm, 8cm, 10cm are: 52%, 93.6%, 100%, 100%, 100%, and 44.9% , 94.2%, 100%, 100%, 100%. Considering all aspects, it is considered that the thickness of the insulation layer is 6cm.