本文首先介绍在分层土壤桥墩局部冲刷试验研究的基础上,采用分析的方法推导出在恒定流条件下计算分层土壤桥墩局部冲刷深度的解析表达式和经初步验证,证明了本文推导的解析式的合理性与实用性, 文中还介绍了在非恒定流条件下分层土壤桥墩局部冲刷试验结果,并与恒定流条件下的冲刷深度进行了比较, In this paper, firstly, based on the local scouring test of layered soil piers, the analytic expression of the local scour depth of layered soil pier under constant flow condition is deduced and the preliminary verification is proved. The rationality and practicability of the formula are also introduced in this paper. The results of partial scouring test of layered soil pier under unsteady flow are also introduced. Compared with the scour depth under constant flow conditions,