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Ⅲ、桥墩冲刷防护桥墩冲刷防护,主要是在河床的演变过程中,防护桥墩的局部冲刷以保证桥墩的安全。一、桥墩局部冲刷坑范围的确定根据笔者在桥墩局部冲刷模型试验中进行的观测,墩前“下降水流”沿墩头前缘向下冲刷床面泥沙时,沿墩壁冲刷形成一个狭窄的沟槽。随着沟槽的不断加深,沟槽外侧的泥沙也不断坍塌下滑,因而在墩前逐渐形成一个漏斗形的局部冲刷坑。局部冲刷坑的
Ⅲ, pier scouring protection Pier pier scour protection, mainly in the evolution of the riverbed, the partial erosion of pier protection to ensure the safety of piers. First, determine the scope of partial scour pit pit According to the author in the pier scouring model tests conducted in the observation of the pier before the “falling water” along the front edge of the pier scouring the bed of sediment along the pier wall erosion to form a narrow Trench. With the continuous deepening of the trench, the silt on the outer side of the trench also continuously collapses and glides, so that a funnel-shaped local scour pit gradually forms in front of the pier. Partial scour pit