十天高速公路涵洞抗水毁设计计算方法研究

Study on the Calculation and Design Method for Culvert's Anti-Washout Ability of Shi-Tian Highway

文章针对十天高速穿越秦巴山遇到的涵洞水毁问题,结合该工程因地质条件异常复杂,影响因素众多情况,介绍了径流形成法、形态调查法这两种涵洞抗水毁设计计算方法。该方法结合设计流,确定涵洞的孔径、净高、临界水深及流速、水力半径、临界坡度、涵内纵坡,设计出适合秦巴山区的涵洞断面尺寸。通过实例验证了该方法的可靠性,为类似工程区域提供参考。

Aimed at the culvert washout problem occurred at where Shi-tian Highway passes through Qinba Mountain and combined with the complicated geological condition,the article introduces the application of runoff forming method and forming investigation method on designing and calculating culvert＇s anti-washout ability.After calculating the aperture,clear height,critical depth of water,flow rate,hydraulic radius,critical slope and longitudinal slope,the method can design a cross dimension that fits the culvert of Qinba mountainous area.The feasibility of this method is proved after test,which provides reference to related projects.