渠道衬砌抗冻胀问题研究

STUDY ON THE FROST HEAVING OF CANAL LINING BLOCKS

研究了渠道衬砌体冻胀破坏的机理，提出削减和抵抗相结合的抗冻胀思路：探讨了冻结力及冻胀力的计算方法：并由此推算出衬砌体抗冻胀应采用的混凝七强度标号和砌体横截面各部位相应的厚度尺寸，拟定出渠道衬砌抗冻胀破坏的合理断面；提出了解决渠道衬砌体抗冻胀问题的具体措施，并在陕西省渭南市石堡川水库干支渠道抗冻胀设计中应用，取得很好效果。既解决了工程抗冻胀问题，节省工程维修费用，又大大地提高了灌溉渠道输水效率，节约水资源。

The mechanism of frost heaving of canal lining blocks is studied and the methods of calculating frost heaving and freezing of canal are discussed. On the basis of the works, a means of combination with cutting and resistance is proposed to deal with the frost heaving. The suitable tab of concrete in canal blocks and corresponding thickness and size in different position of cross section are calculated to obtain a optimum section of canal lining blocks with frost heaving, and some detailed measures are put forward to solve the problem of frost heaving in canals. This research was applied to devise the main canal and branch canal in Shibaochuan Reservoir and a good effect was realized. It not only solves the problem of frost heaving of canal but also declares the maintenance cost, improves the efficiency of routing, and saves water resources.