弯道超高法在泥石流流速计算中的应用——以四川省汶川县G317国道磨子沟泥石流为例

Application of super-elevation-in-bend method in current velocity calculation of debris flow——A case study of Mozi Valley debris flow at Highway G317, Wenchuan,Sichuan

选取四川省汶川至马尔康公路线的磨子沟作为试验对象,采用弯道超高法推算其泥石流流速。进而可以计算出该次泥石流的平均流量,为公路的改建工程提供设计依据。经过实地调查,用此方法计算磨子沟2005年8月17日暴发的泥石流流速为4.4m/s。同其他流速方法计算的结果相比较,前者值偏大,且偏向于工程安全值。弯道超高法可以解决泥石流观测的局限性和泥石流发生的不可重复性。此方法简便易行,对泥石流防治工程具有一定的实用价值。

The supper-elevation-in-bend method is a model to calculate the current velocity of debris flow. In this article, the Mozi Valley, locating along the Wenchuan-Maerkang Highway, is chosen as experimental area. First the supperelevation-in-bend method to calculate its current velocity of debris flow is introduced in order to model the average flux and results of two methods have certain deviation. Comparing to the latter method, the supper-elevation-in-bend method may solve the limitation of the observation to debris flow. And the irrepeatablility of debris flow, and what＇s more, this method is simple. Therefore, the supper-elevation-in-bend method is useful in practice for the prevention of debris flow.