A new small-scale experimental device for testing backward erosion piping

Abstract Backward erosion piping is driven by seepage forces acting on the soil grains at downstream end of path. A new device for laboratory testing backward progression was developed and tested. The consists a plexiglass prism which path has been predefined. equipped with an inflow consisting gravel separated from tested sand strainer. hydraulic gradient along pipe observed set piezometers pressure cells, discharge measured volumetrically. transported sediment trapped in vertical cone located device. path, piezometric heads material two synchronous cameras. 15 trial tests have carried out to date, these, interim results are presented.