论文部分内容阅读
考虑出流与下游的联接,溢流堰的端部常设反弧段。不论采用哪种消能方式,溢流堰堰面曲线与反弧段的联接只出现有斜直段和无斜直段两种情况。当溢流堰较低,下游水位较深(底流消能不经济的情况下)而需要设置较高的挑流鼻坎时,则出现无斜直段的联接方式;反之,出现有斜直段的联接方式。对于确定联接点(切点,如图1中的T点以及图3中的a、b点)与反弧段圆心(如图1、3中的O_1点)的位置(坐标、高程),以往的设计中常常采用“试凑法”去往返多次试求,这样不仅时间较长,而且精度较差。
Considering the outflow and downstream connection, the end of the weir is provided with an anti-arc section. No matter what kind of energy dissipation mode is adopted, the connection between the curve of the weir weir surface and the anti-arc section shows only two cases of inclined straight section and non-inclined straight section. When the overflow weir is low and the downstream water level is relatively deep (underflow can not be economically uneconomical) and a high pick-nose ridge needs to be set, there is a connection mode with no oblique straight sections; on the contrary, there is a diagonal straight section The way of connection. For determining the position (coordinates and elevation) of the joint point (point of intersection, point T in FIG. 1 and points a and b in FIG. 3) and the center of the arc of opposite arc (point O_1 in FIGS. Often used in the design of “trial and error method” to and from many times to seek, so not only longer, but also less accurate.