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在公路工程中,涵洞所占比例往往很大。涵洞过流能力是涵洞孔径设计的依据。《公路桥涵标准图拱涵(JT/GQB021-73)》指出,当涵洞底坡小于该标准图所列临界坡度时,其过流能力应按下列公式折减。 Q=(i/i_k(1/2))Q_k (1)式中:Q_K——标准图中计算涵洞过流能力; i——所设涵洞底坡; i_K——涵洞临界坡度; Q——折减后的涵洞过流能力。
In highway engineering, the proportion of culverts is often large. Culvert overcurrent is the basis of culvert aperture design. “Highway bridges and culverts standard figure arch culvert (JT / GQB021-73)” pointed out that when the culvert slope is less than the critical slope of the standard figure, the overcurrent capacity should be reduced according to the following formula. Q = (i / i_k (1/2)) Q_k (1) Where: Q_K - Calculation of culvert overcurrent in standard plot; i - Culvert of culvert; i_K - Critical slope of culvert; Q - Decreased culvert flow capacity.