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考虑渗透力作用,分析坡面泥沙受力特点,推导出岸坡均匀沙的起动条件和临界切应力计算公式,并采用不同渗流比降和不同水流方向的算例,以及长江中下游典型岸坡的实例,对渗流作用作出了定量分析。结果表明,泥沙起动流速曲线存在明显的转折点,可以解释崩岸的突发性;向坡外的渗流将大幅降低岸坡泥沙起动条件;冲刷水流方向也影响泥沙起动流速,在接近零流速破坏坡角时影响显著。
Taking into account the effect of seepage force, the paper analyzes the characteristics of silt stress on slope and deduces the calculation formulas of the starting conditions and the critical shear stress of even sand on bank slope. The calculation formulas of different seepage ratio and different flow direction are given, Examples of slopes make a quantitative analysis of the seepage action. The results show that there is a clear turning point in the velocity curve of sediment start-up, which can explain the sudden occurrence of bank collapse. The seepage to the slope will greatly reduce the sediment start-up conditions of the bank slope. The effect of flow velocity when destroying the slope angle is significant.