路基边坡坡面冲刷基本理论

Basic Theory of Side Slope Surface Scouring

以固液两相作用为基础 ,探讨冲刷过程中土颗粒的受力情况 ;分别从坡面流剪力和流速入手 ,建立坡面冲刷发生条件的理论表达式 ;根据冲刷的物理实质 ,坡面冲刷分为推移冲刷和悬移冲刷 ,二者之和就是总冲刷强度 ,并由坡面流具有的能量、能量转换和能量守恒入手 ,建立坡面冲刷强度的理论表达式。

Slope surface scouring, a topic studied infrequently, is one type of side slope damage and an environmental problem along highway and railway Forces acting on soils during slope surface scouring are studied all round The forces include drag force, lift force, seepage force, dispersion force, cohesive force, etc The stability of soil particles on the slope surface depends on the above forces acting on them Based on conditions for equilibrium of the forces acting on soil particles, relations between water velocity and shearing force, this paper respectively sets up the theoretical formulae of occurring conditions of side slope scouring According to the essence of slope surface scouring, it includes two parts: bed load and suspended load Based on conservation of energy, the theoretical formula of the total scouring capacity is established From what has been discussed above it sets up the framework of dynamic theory for slope surface scouring