River scouring is the primary cause of impulsive riverbank failure. Its direct effect is to cause catastrophic changes in the structure of the riverbank slope, which then leads to riverbank collapse. However, its internal evolution mechanism is unclear. To solve this problem, a continuous-discontinuous deformation analysis method that can reveal the evolution mechanism has been developed based on the Discontinuous Deformation Analysis (DDA) method. It discretizes the soil into Voronoi-shaped sub-blocks, forces the displacement coordination of the continuous medium through the defined bar element between the sub-blocks, and simulates the evolution from continuum to discontinuum through the bar element failure. At the same time, the open-close iteration algorithm is still used to deal with the contact between the real block boundaries and there is no need to judge the contact between sub-blocks. Then, for the first time, a generalized model of riverbank collapse caused by flow erosion is built, the entire failure process is simulated, and the effects of different soil strengths and slope ratios on the failure mode are discussed. The results indicate that it is insufficient to explain the mechanism of riverbank collapse only by using the concept of circular slip failure of a traditional soil slope.

河流冲刷是冲动性河岸倒塌的主要原因。其直接影响是引起河岸边坡结构的灾难性变化，进而导致河岸崩塌。然而，其内部进化机制尚不清楚。为了解决这个问题，基于不连续变形分析（DDA）方法开发了一种可以揭示演化机制的连续-不连续变形分析方法。它将土壤离散为 Voronoi 形子块，通过子块之间定义的杆单元强制连续介质的位移协调，并通过杆单元失效模拟从连续体到不连续体的演变。同时，仍然使用开闭迭代算法来处理真实块边界之间的接触，无需判断子块之间的接触。然后，首次建立了流蚀河岸崩塌的广义模型，模拟了整个破坏过程，讨论了不同土体强度和坡比对破坏模式的影响。结果表明，仅用传统土质边坡圆滑破坏的概念来解释河岸崩塌机理是不够的。讨论了不同土体强度和坡度比对破坏模式的影响。结果表明，仅用传统土质边坡圆滑破坏的概念来解释河岸崩塌机理是不够的。讨论了不同土体强度和坡度比对破坏模式的影响。结果表明，仅用传统土质边坡圆滑破坏的概念来解释河岸崩塌机理是不够的。