纵向增强体土石坝漫顶溢流安全性能分析

为了验证纵向增强体土石坝相对于常规土石坝抵御洪水漫顶破坏的安全程度,基于相关试验分析洪水漫顶造成下游堆石料被冲刷流失,以及纵向增强体土石坝这一新坝型的安全运行机理。通过工程实例验证了纵向增强体土石坝将常规土石坝发生的漫顶溃坝模式改变为坝体冲坑模式,从而延迟了整个坝体的溃决时间,为工程抢险和下游群众转移争取了更多的时间;增强体是否被破坏,取决于冲刷深度与墙体被冲蚀临空后的极限受力状态的关系比较。

Analysis on the overtopping safe operation performance of longitudinal reinforced rockfill dam

In order to further verify the safety degree of the longitudinal reinforced rockfill dam against the flood overtopping damage compared with the conventional rockfill dam dam, this paper analyzes the erosion of downstream rockfill caused by the flood overtopping based on relevant experiments, during which the downstream material is washed away forming a scour hole that is partially exposed to the air at the downstream side. Besides, the safe operating mechanism of the reinforced dam is also obtained from the experiments. The advantage of this new dam is changing the conventional overtopping failure mode to the progressive scour hole development mode, therefore it can delay the dam breaking, and provide additional time for the repair and evacuation. Calculations show that, whether the reinforced body will fail depends on the scour depth and its ultimate stress distribution.