Study on Insulation and Anti-frost Heave Effect of Polystyrene Board Under the Condition of Mold Bag Concrete

As a new lining technology, mould bag lining technology has been widely used in recent years. In this paper, the channel frost heave in Hetao irrigation area of Inner Mongolia was studied and a field in-situ test platform was established. The experimental study on the insulation and anti-freeze of polystyrene board under the condition of concrete bag with different thickness was carried out by setting the concrete bag with different thickness and the test block of polystyrene board with different thickness. The research shows that the total accumulated temperature increases by 3.93%~9.22% and the frost heave rate decreases by 18.28%~55.44% by adding 2–5 cm mold bag concrete on the basis of 10 cm mold bag concrete. Laying 4~8 cm polystyrene board, the total accumulated temperature increased by 207.63%~272.25%, and the frost heave rate decreased by 71.43%~96.6%. The absolute slope of the curve fitting the frost heave rate and soil temperature decreased by 44.6%~58.7%. Laying polystyrene plate can inhibit the migration of soil water during freezing-thawing period, reduce the formation of frozen front ice intercalation, and thus reduce the damage of channel frost heave.