基于Flow-3D的东安工程桩坝冲刷数值模拟研究

Numerical Simulation of Scouring of Dong’an Permeable Pile Dam Based on Flow⁃3D

透水桩坝因其独特的缓流落淤效果而在黄河流域得到广泛应用,其作为不抢险建筑物设计,但在多年的运行过程中,黄河下游复杂的冲淤情况使透水桩坝出现了不同程度的磨损、位移,东安工程甚至还发生了桩排倒塌。为厘清透水桩坝出险原因,利用Flow-3D软件对东安工程分别进行入流角度为45°、60°、90°的冲刷数值模拟,结合工程现场采用多波束测深系统测量所得数据,实现了透水桩坝冲刷仿真模拟的精准建模。结果表明:60°、90°入流角度的冲刷深度与实测断面冲刷深度拟合较好,最大误差仅为9.4%,模拟结果比较理想;Flow-3D软件对透水桩坝冲刷模拟有较好的适用性。研究成果可为透水桩坝的设计和后期安全运行提供依据。

Permeable pile dam is widely used in the Yellow River basin because of its unique slow flow and sedimentation effect.It is de⁃signed as a non rescue building.However,in the process of many years of operation,the complex scouring and sedimentation in the lower reaches of the Yellow River has caused varying degrees of wear and displacement of the permeable pile dam,and even the pile row of Dong’an project collapse.In order to clarify the causes of the accident of permeable pile dam,the scouring numerical simulation of Dong’an Project with inflow angles of 45°,60°and 90°was carried out by using Flow⁃3D software.Combined with the data measured by multi beam sounding system on the project site,the accurate modeling of scouring simulation of permeable pile dam was realized.The results show that the error between the simulated maximum scouring pit depth and the field measured scouring pit depth is about 9.4%,and the simulation results are i⁃deal;Flow⁃3D software has good applicability for scouring simulation of permeable pile dam.The research results can provide a basis for the design and safe operation of permeable pile dam in the later stage.