The cascading failure of multiple landslide dams can trigger a larger peak flood discharge than that caused by a single dam failure. Therefore, for an accurate numerical simulation, it is essential to elucidate the primary factors affecting the peak discharge of the flood caused by a cascading failure, which is the purpose of the current study. First, flume experiments were done on the cascading failure of two landslide dams under different upstream dam heights, downstream dam heights, and initial downstream reservoir water volumes. Then, the experimental results were reproduced using a numerical simulation model representing landslide dam erosion resulting from overtopping flow. Finally, the factors influencing the peak flood discharge caused by the cascading failure were analyzed using the numerical simulation model. Experimental results indicated that the inflow discharge into the downstream dam at the time when the downstream dam height began to rapidly erode was the main factor responsible for a cascading failure generating a larger peak flood discharge than that generated by a single dam failure. Furthermore, the results of a sensitivity analysis suggested that the upstream and downstream dam heights, initial water volume in the reservoir of the downstream dam, upstream and downstream dam crest lengths, and distance between two dams were among the most important factors in predicting the flood discharge caused by the cascading failure of multiple landslide dams.

多个滑坡大坝的级联故障可引发比单个大坝故障更大的洪峰流量。因此，为了进行精确的数值模拟，必须阐明影响级联故障引起的洪峰流量的主要因素，这是当前研究的目的。首先，对两个滑坡大坝在不同上游大坝高度，下游大坝高度和初始下游水库水量下的级联破坏进行了水槽试验。然后，使用数值模拟模型重现了实验结果，该模型代表了由顶流引起的滑坡坝侵蚀。最后，利用数值模拟模型分析了由级联破坏引起的洪峰流量的影响因素。实验结果表明，当下游大坝高度开始迅速侵蚀时，流入下游大坝的流量是导致级联故障产生峰值洪水流量的主要因素，而单个大坝故障产生的峰值洪水流量更大。此外，敏感性分析的结果表明，上游和下游大坝的高度，下游大坝水库的初始水量，上游和下游大坝的坝顶长度以及两个大坝之间的距离都是预测洪水的最重要因素。由多个滑坡坝的级联破坏引起的泄洪。