基于坝头水毁程度判别指标的抛石丁坝水毁研究

抛石丁坝是河道中应用十分广泛的整治建筑物,能够束水攻沙,保护岸滩免受水流冲刷,然而抛石丁坝水毁现象时常发生。针对这一现象,利用动床水槽物理模型试验对平原河流丁坝的水毁破坏进行了研究,分析丁坝水毁破坏的常见形式,认为坝头块石的坍塌流失是影响丁坝整体稳定性的主要因素,即抛石丁坝稳定性可基于坝头水毁来研究。在此基础上,定义了坝头水毁程度判别指标,研究指标的求解方法和坝头水毁程度等级划分方法,得到了坝头不同水毁程度对应的指标值,并对丁坝维护时机的选择加以说明。该方法为抛石丁坝的维护提供了解决思路,有利于抛石丁坝整治效果的持续发挥。

Study on flood damage of riprap spur dike based on evaluation indicators of flood damage at dam head

The riprap spur dikes are widely used in waterway regulation projects,which can clearing sands with the converging flow,and protect the beach from erosion.However,the damage of riprap spur dike frequently occurs.For this phenomenon,movable-bed physical model tests are conducted on the damage of dikes in plain-river,and the common damage forms of spur dike are analyzed.It is believed that the collapse and loss of the block stones at the dam head are considered as the main factors causing the overall damage of spur dikes.That is,the stability of riprap spur dikes can be studied based on the damage of dam heads.Then,the meaning and solution method of flood damage evaluation indicator,and damage grade at the dam head are put forward.The indicator values of different damage degrees are given in combination with damage grade.As a recommendation,the selection of the maintenance time of the dike is provided.This method provides a new solution for the maintenance of riprap spur,and is conducive to the sustainable development of the regulation effect of riprap spur dikes.