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本项试验是确定黄河长东二桥施工期间沉井吸泥下沉时,是否危及附近既有桥安全,以及设计洪水流量条件下新桥的局部冲刷深度。为探索模拟沉井通过吸泥逐步下沉及其周围局部冲刷相似的试验方法,除一般局部冲刷常用的相似准则以外,还计入了沉井重力相似、吸泥(输沙量)相似、沉井外壁摩阻相似等方面的相似准则。并研究拟定了一些论证沉井逐步下沉时对附近既有桥安全影响的试验方案和判别方法。
This test is to determine whether sinking mud sinking during the construction of the Second Changlong Second Bridge in the Yellow River is endangering the safety of existing bridges in the vicinity and the local scouring depth of Xinqiao under the design flood discharge conditions. In order to explore similar test methods for simulating sinkhole sinking by suction as well as local scouring around it, in addition to the similarity criteria commonly used for local scouring, Well wall friction similarities and other aspects of the similar criteria. And also studied and drafted some experimental schemes and discriminating methods for demonstrating the influence on the existing bridge safety in the vicinity when the caisson is gradually sinking.