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简述溢洪道位置的选择。

问答题
2021-12-26 14:21
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正确答案
工程量小:
要尽量利用天然的有利地形,常将溢洪道选择在坝端附近,马鞍形地形的凹地处,或地形较平缓的山坡处,可以节省开挖土石方量,减少工程投资,缩短工期。
地质良好:
溢洪道应选在土质坚硬,无滑坡塌方或非破碎岩基上。
溢洪道泄洪安全:
将溢洪道进口布设在距坝端至少10m以外,出口设在距坝坡脚线20m以外,溢洪道尽可能不和放水建筑物放在同一侧,以免互相造成水流干扰和影响放水建筑物的安全。
水流条件良好:
溢洪道轴线布设为直线状,若因地形地质条件不允许布置成曲线时转弯半径应不小于渠道水面宽度的五倍,并应在凹岸做好砌护工程。

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