桥梁墩台偏斜冲刷试验研究

Skew scouring test and study of bridge piers and abutments

针对偏斜度、阻水比、单宽流量对桥梁墩台最大冲刷深度的影响,进行模型试验,并对搜集到的试验数据进行整理分析。主要结论是:在桥梁墩台存在偏斜度的情况下,按投影折算方法计算的最大冲刷深度值比试验值大5%左右,且偏斜度越大,偏差越大。通过对广西南宁至百色高速公路上9座大桥最大冲刷深度的计算值和试验值进行对比分析,验证了试验成果的正确性,为此建议对规范中冲刷深度的计算公式做适当修正。

In view of the effect of skew angle,proportion of backwater and discharge per unit width on the maximum scouring depth of bridge piers and abutments, model test was conducted and the results of test were studied,rendering the conclusions that when bridge pier or abutment has skew angle,the maximum scouring depth calculated by projection reduction method is approximately 5% greater than the test data;and the greater the skew angle is,the greater the difference will become.Taking the nine bridges on the expressway from Baise to Nanning as samples,comparison was made between the calculating values and testing data,which confirms the accuracy of testing results.It is also suggested to make certain revision to the scouring depth calculation formula as stipulated in Standard.