With the utilization of underground space, backward erosion piping (BEP) has been observed in many underground structures. Different from BEP in embankments or river dikes, the BEP in underground structures is usually triggered by a sudden flow of water and persists in a “progression phase,” in which the piping process can always reach an equilibrium before higher hydraulic loads are employed. In this study, the progression of BEP with sudden and gradual hydraulic loads was investigated using a radial Hele-Shaw cell. The test results indicated that the progression of BEP could be strongly influenced by the hydraulic loading speed. Once a faster hydraulic loading method was employed, the erodible medium could organize itself and show a greater resistance to erosion; additionally, the erosion pattern could be more uniform. These findings were included in a discussion of the erosion mechanism.

随着地下空间的利用，在许多地下结构中已经观察到反向侵蚀管道（BEP）。与堤防或河堤中的 BEP 不同，地下结构中的 BEP 通常由突然的水流触发并持续处于“进展阶段”，在此阶段，管道过程始终可以在使用更高的水力载荷之前达到平衡。在这项研究中，使用径向 Hele-Shaw 单元研究了 BEP 在突然和渐进的液压载荷下的进展。试验结果表明，BEP 的进程会受到液压加载速度的强烈影响。一旦采用更快的水力加载方法，可侵蚀介质可以自行组织并表现出更大的抗侵蚀能力；此外，侵蚀模式可以更均匀。