弯道抛石护岸水流特征及水毁试验研究

Experimental study on flow characteristics and damage of rock riprap used in river bend

平顺抛石护岸在长江中下游应用最为广泛,能够增强堤岸的抗洪能力,保障中下游广大平原地区和沿江各大中城市的防洪安全。然而,护岸块石常常发生滑落导致护岸破坏。为了解其破坏机理,进行了不同岸坡坡度、不同块石粒径及大小、不同流速等条件下的水槽试验,从块石受力、弯道水流特征、块石位移特征及坍塌特征等方面研究了抛石护岸的水毁,提出了抛石护岸破坏程度的判别指标并给出需要维护的时间点的建议。

Riprap protection of embankment is most widely applied in the middle and lower Yangtze River which can increase the flood control capacity of embankment and safeguard the flood safety of plains and major cities along the Yangtze River.However,rubbles crept down frequently that can lead to the damage of revetment. In order to comprehend the failure mechanism,flume experiments were carried out under different conditions such as different slope gradient,different particle size of rubbles,and different velocity.The damage of riprap revetment was researched from the characteristics of rubble force,flow characteristics,rubble displacement and rubble collapse.And then,the discriminant index of the degree of damage and the time node for maintenance was put forward.