Geosynthetics horizontal permeameter use precautions

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**Geosynthetics Horizontal Permeameter Usage Precautions** 1. The test water must be degassed or distilled water to ensure accurate results and prevent air bubbles from affecting the measurement. 2. Cut the geotextile or geomembrane into three pieces for each sample. If the material is thin, stack two or three layers together as a group. In such cases, cut six or nine pieces accordingly to maintain consistency during testing. 3. Enclose the sample in a latex film or rubber sleeve, ensuring it is flat and free of wrinkles. Check that there is no leakage around the edges. For direct loading systems, carefully install the upper and lower cushion layers to apply even pressure across the sample. 4. Apply a pressure of 2â€“5 kPa to hold the sample in place, then fill the water reservoir with degassed water to eliminate any air trapped within the sample. Ensure the sample becomes fully saturated before starting the test. 5. Choose the hydraulic gradient based on site conditions. If the exact conditions are unknown, keep the gradient below 1.0 to avoid overloading the sample. 6. Conduct at least three pressure tests under different gradients. One should be slightly higher than the design value, and another slightly lower. Apply the minimum normal pressure for 15 minutes, then raise the water level to the desired gradient. 7. Once the flow stabilizes, measure the time it takes for 500 cmÂ³ of permeate to pass through, or record the volume of water that flows through in 15 minutes. Perform three parallel measurements for each gradient to improve accuracy. 8. Repeat the process for other hydraulic gradients. 9. Gradually increase the normal pressure and repeat the steps to complete the test under different load conditions. By following these precautions, you can ensure reliable and consistent results when using a geosynthetics horizontal permeameter. Always double-check the setup and calibration before beginning the test to maintain data integrity.

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