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利用水平比尺与铅直比尺均为100的正态断面模型,研究了杭州湾跨海大桥非通航孔两个桥跨的桥墩对水流的影响。方案一为50m跨径的桥墩方案,在模型中布置了7跨6个桥墩;方案二为70m跨径的桥墩方案,在模型中布置了5跨4个桥墩。在桥位附近的不同距离处还布设了5条断面16个流速测点和4个水位测站,以反映不同桥墩对周围环境的影响,结果表明,两个方案的流速变化率均在9%以内,水位壅高值在0.17m以内。相对而言,方案一对水流影响稍大,但两方案的流速变化率最大差异仅为1.6%,水位变化最大差异为0.03m,与杭州湾跨海大桥整体模型的试验结果基本一致。由于两个方案对水流的影响均在同一量级,且50m跨径的桥墩可以节省巨额投资,又便于施工,因此,建议杭州湾跨海大桥的非通航孔采用50m跨径。
By using the normal cross section model whose horizontal scale and vertical scale are both 100, the influence of bridge piers on the water flow of non-navigable bores of Hangzhou Bay Sea-Crossing Bridge was studied. The first scheme is a bridge pier with a span of 50m. Seven bridges and six piers are arranged in the model. The second scheme is a bridge pier with a span of 70m. Five bridges and four piers are arranged in the model. In the vicinity of the bridge at different distances also arranged five cross-section 16 flow measurement points and four water level stations to reflect the impact of different piers on the surrounding environment, the results show that the flow rate of the two programs were 9% Within the water level 壅 high value within 0.17m. However, the maximum difference between the two schemes is only 1.6% and the maximum difference between the water levels is 0.03m, which is basically consistent with the experimental results of the overall model of the Hangzhou Bay Bridge. Because both schemes have the same magnitude impact on water flow, and the piers of 50m span can save huge investment and facilitate construction, it is suggested that the non-navigable hole of Hangzhou Bay Sea-Crossing Bridge adopt 50m span.