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圆弧底渠道断面,实质上就是渠道上部为梯形,下部为弓形的复合断面,梯形的两腰和弓形的圆弧相切。断面型式和尺寸符号见图1。圆弧底断面具有过水能力较强,输沙率高,抗冲刷性能好,抵抗基础土壤冻胀性能强等优点;缺点是设计和施工比梯形断面复杂。但是,经过多年的运用,很受群众欢迎。现在,昌吉地区的防渗渠道,干支斗渠多采用这种断面型式。
Arc bottom channel section, in essence, is the trapezoid upper part of the channel, the lower part of the arch-shaped cross-section, trapezoidal waist and arcuate arc tangent. Section type and size symbols shown in Figure 1. The arc bottom section has the advantages of strong water-passing ability, high sand transport rate, good anti-scouring performance and strong resistance to frost heaving of the foundation soil. The disadvantage is that the design and construction are more complex than the trapezoidal section. However, after years of use, it is very popular with the public. Now, Changji impermeable channels, dry-channel bucket more use of this section type.