【摘要】 广东省韶关市曲江区连续遭遇3次强降雨，苍村水库溢洪道持续泄洪近6 d后，溢洪道下游底板出现垮塌险情。该文根据地质勘察、地质雷达与抽芯探测结果，以及设计图纸等，计算分析溢洪道出险的主要原因为：溢洪道在暴雨和高水位等极端情况下，水库中的水通过地质断层和底板下的土向下游渗透，逐渐带走细小颗粒，形成渗水通道，导致底板脱空，并最终在扬压力和脉动压力等作用下发生破坏。研究成果可为类似溢洪道出险原因分析及除险加固处理工程提供参考。更多还原

【Abstract】 Qujiang district suffered three consecutive heavy rainfall events. After nearly six days of continuous flood discharge through the spillway of Cangcun reservoir, a collapse hazard occurred in the downstream floor of the spillway. Calculations and analyses based on geological surveys, geological radar and core detection results, and design drawings revealed the main causes of the spillway failure: Under extreme conditions such as heavy rain and high water levels, reservoir water infiltrated downstream through geological faults and soil beneath the floor, gradually eroding fine particles to form seepage channels, which led to floor voiding. Eventually, the floor failed under the combined action of uplift pressure and pulsating pressure. This analysis of the spillway failure causes and the proposed risk removal and reinforcement measures can provide references for similar engineering projects.更多还原