高寒区输水渠道渠基蓄热增温防冻胀技术原型试验

Field Investigation of the Anti-Frost Heaving Technology by Heat Storage in Canal Foundation for Water Delivery Canals in Cold Regions

冬季输水渠道衬砌板在基土冻胀和冰压力双重作用下,在行水位及其上部易发生开裂、折断等破坏,目前还未有利用太阳能或风能等绿色能源进行渠基主动、低碳增温的防冻胀技术。为此,研发了由抛物面聚光槽、集热管、太阳追踪器、散热通道、碎石槽蓄热体与散热空气循环风机组成的渠基风光能蓄热增温系统,其散热通道采用紧贴渠坡衬砌布置和碎石槽底部布置两种形式。通过北疆某渠道工程的现场安装与温度监测,分析了该技术的增温效果与适用性。结果表明:渠基风光能蓄热增温系统可有效提升土温,削减冻深,具有良好的工程防冻胀应用效果,可为寒区渠道冬季输水以及渠道升级改造提供技术支撑。

Under the coupling action of the soil frost heaving and ice pressure,the water conveyance canal lining is prone to cracking and breaking at the water level fluctuation areas and its upper part.At present,there is no anti-frost heave technology that uses green energy such as solar energy or wind energy which is active and low-carbon emission technologies to increase the temperature of the canal foundation.To this end,a canal foundation heating system with solar energy and wind energy,composed of parabolic condensing trough,heat collecting pipe,sun tracker,heat dissipation pipes,heat storage body with gravel trough and heat dissipation air circulation fan is developed.The heat dissipation pipes are arranged close to the canal slope lining and at the bottom of the gravel trough.Through the field instal-lation and temperature monitoring of a canal project in Northern Xinjiang,the temperature increasing effect and applicability of this technology are analyzed.The results show the canal foundation heating system with wind and solar energy can effectively increase the soil temperature and reduce the freezing depth.It has a good application for engineering anti-frost heaving,and can provide technical support for water delivery canals in winter in cold regions.