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混凝土U形渠道是一种新型结构渠道,其断面见图1。这种渠道在陕西、河南等地采用较多。多年实践证明,混凝土U形渠道不仅具有很好的防渗效果(能减少渠道渗漏达90～95%),而且由于湿周短,流速快,输沙能力强,在引用水库排淤和高含沙水灌溉、改良土壤、提高肥力方面也颇见成效;同时其下部呈半圆反拱,抗地基冻胀性能好,加之,占地只有
Concrete U-shaped channel is a new type of structural channels, the cross-section shown in Figure 1. This channel in Shaanxi, Henan and other places to use more. Years of practice has proved that concrete U-shaped channel not only has good seepage prevention effect (can reduce channel leakage up to 90 ~ 95%), but also because of short wet cycle, fast flow rate and strong sand transport capacity, Sandy irrigation, improve the soil, improve fertility also quite successful; at the same time the lower part of the semicircular inverted arch, antifreeze frost resistance performance, in addition, covers only