Abstract
Seepage piping seriously threatens the safety of levee, but study on mechanism of regressive erosion is not in-depth. According to the characteristics of piping channel upstream movement, we designed a set of experiment equipment. In given experiment condition, we did the experiments with 2 kinds of overburden and 2 different position of piping channel, and measured the value of each piezometric tube. As the experiment results shows, the tip hydraulic gradient can better reflect the problems of regressive erosion, comparing with average hydraulic gradient between piping exit and outer river. The development of the regressive erosion is determined by the tip hydraulic gradient. It will stop expanding when the tip hydraulic gradient decreases after large-scale upstream movement. This paper lays a foundation for further theoretical study.
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