Geosynthetics horizontal permeameter use precautions - Database & Sql Blog Articles

Geosynthetics horizontal permeameter use precautions Geosynthetics horizontal permeameter use precautions: 1, 1) test water should be degassed water or distilled water.
2) Cut the machine and the flat machine to 3 pieces each. When the sample is thin, take 2 or 3 layers of the sample to be tested as a group. At this time, 6 or 9 pieces should be cut accordingly. Sample.
2, 1) The sample is enclosed in a latex film or rubber sleeve, and the sample should be flat without wrinkles.
There should be no leakage around the perimeter. For the direct loading type, the upper and lower cushion layers should be carefully installed to subject the specimen to uniform normal pressure.
2) Apply a pressure of 2-5 kPa to place the sample in place, then inject degassed water into the water level container to remove air bubbles from the sample. The sample should be saturated during the test.
3) Select the hydraulic gradient according to the site conditions. When the situation is unknown, the hydraulic gradient should be no more than 1.0.
4) Select at least three pressure tests according to site conditions or design requirements, one pressure is slightly larger than the design value, and one is slightly lower than the design value. Apply a minimum of normal pressure to the sample for 15 min. Raise the water level of the container to the desired hydraulic gradient. After the water flow has stabilized, the time to pass the 500 cubic centimeters of permeate water is measured, or the amount of water passing through within 15 minutes is recorded. Three measurements were taken in parallel under each hydraulic gradient.
5) Repeat the above steps for another hydraulic gradient.
6) Increase the normal pressure and repeat the above steps to complete the test under the other normal pressure.