黄土边坡坡面冲刷的临界坡度

Research on Critical Gradient for Surface Erosion of Loess Slope

边坡坡面冲刷存在一个临界坡度,边坡坡度接近临界坡度,冲刷量最大。通过能量守恒原理,建立了临界坡度的计算公式,它与边坡坡长以及降雨强度和坡面的粗造程度存在一定的函数关系。通过实例分析了临界坡度和单级坡高的确定,理论分析与工程实践基本一致,说明理论分析是合理可行的。

Erosion amount reaches the maximum as slope angle is close to critical slope,which is existed in slope surface scouring.A calculation formula of critical gradient,functionally related with slope length,precipitation intensity and slope surface roughness,is established by energy conservation principle.The determinations of critical gradient and single-stage height of slope are analyzed through an example.Being basically identical with engineering practice,the theoretical analysis done is proved to be reasonable and feasible.