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弯道超高是泥石流运动的显著特征。以往研究认为弯道超高完全是由于泥石流的离心运动造成的,未考虑泥石流在弯道运动时的冲起爬高效应。本文假设弯道超高和爬高分别由泥石流沿弯道的切向和法向速度引起,根据弯道处速度矢量三角形和圆弧三角形的几何相似关系,推导了考虑爬高效应的泥石流弯道超高公式。该公式依赖于弯道的内外曲率半径比、泥石流速度和沟壁倾角,适用于弯道圆心角小于60°和沟道较宽的情形。经云南东川蒋家沟的野外实际调查数据以及其他文献中的数据验证,与实测值误差较小,可用于泥石流弯道爬高的实际计算中。
The high curve is a significant feature of debris flow movement. In the past, it was considered that the ultra-high bends were entirely caused by the eccentric movement of the debris flow, and the effect of rising and climbing of the debris flow during the curve movement was not considered. In this paper, we assume that the high and high climbs are caused by the tangential and normal velocities along the corners of the debris flow. According to the geometrical similarity between the velocity vector triangles and the arc triangles at the corners, the debris flow curve Ultra-high formula. The formula relies on the curvature radius ratio of internal and external corners of the curve, debris flow velocity and inclination of the ditch wall. It is suitable for the case where the center angle of the curve is less than 60 ° and the channel is wide. The actual investigation data of Jiangjiagou in Dongchuan, Yunnan Province and other data verified that the error with the measured value is small and can be used in the actual calculation of the climb of the debris flow bend.