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针对桥墩局部防冲刷问题,从减小冲坑深度和减弱墩前近底垂向流速角度出发,在实验室建立桥墩防冲板模型,利用多轮正交试验、方差分析及极差分析防冲板3个控制因素的主次关系,并确立防冲板结构的最佳组合形式。结果表明,防冲板长半轴长度和安装位置均为重要的影响因素,安装位置的影响作用略大于长半轴长度,但防冲板短半轴长度对桥墩防冲影响甚微,进而获得桥墩防冲板模型的最佳结构形式为H1A3B1,即安装位置为0.2h(h为水深)、防冲板长半轴长度为2r(r为模型桥墩半径)、短半轴长度为1.4r。
Aiming at the local anti-scouring problem of pier, from the perspective of reducing the depth of scour hole and reducing the vertical velocity near the bottom of pier, a pier anti-scouring plate model was established in the laboratory. Multiple rounds of orthogonal test, analysis of variance and range analysis Board the three primary and secondary control factors, and establish the best combination of anti-punching board structure. The results show that the length and installation position of the long half shaft of the anti-punching plate are all important factors, and the influence of the installation position is slightly greater than the length of the semi-semi-shaft. However, the short semi- The best structural form of bridge pier bumper plate model is H1A3B1, that is, the installation position is 0.2h (h is the depth of water), the length of the long half shaft of baffle plate is 2r (r is the radius of the bridge piers), and the short half-shaft length is 1.4r.