Прибор для испытания отверстий

In the test, a soil specimen prepared with standard compaction is subjected to water flow with a constant head difference. A hole of 1 mm diameter is opened in the specimen with a needle tool. The water in the cell flows through this hole. During the flow, the discharge, color change, and tunnel formation over time are observed. According to the data obtained, the specimen is classified as “dispersive” or “non-dispersive.”