考虑管径拓展的管涌发展过程模拟

堤基管涌发展试验表明,在管涌通道发展过程中,通常是上游管径较小而下游管径较大,管道尖端土体颗粒比较松散.现有的堤基管涌发展模型采取单一管径处理方法模拟管涌通道发展过程,管涌发展过程中孔隙率保持不变,难以模拟通道侧向扩展特征.本文采用泥沙运动力学方法,考虑通道发展过程中的颗粒级配调整和孔隙率变化,使得管涌通道发展情况更加符合实际.数值模拟表明,改进后的模型能够刻画管涌通道发展中的管径变化、通道发展方向、流量大小和临界水头等主要特征.

Simulation of Piping Process with Consideration of Pipe Expanding

Experiments of dyke piping often show that the piping tunnel increases its size from upstream to downstream.Existing simulation models of piping is incapable of representing this phenomenon since the pipe size and sand porosity are usually fixed.This paper presents a simulation model of piping process with consideration of pipe expanding.Hydraulic erosion in the piping tunnel is modeled to represent pipe expansion.The adjustment of sand gradation curve and porosity within pipe tip during the piping process ...