An overview based on SL / T235-1999, JTGE50-2006, GB / T19979.1-2005 geosynthetics seepage performance. Hydrostatic GB / T19979.2-2006 geosynthetics seepage performance. Development of national standards for the design permeability coefficient. Seepage of measurement applicable to all types of geotextile material, stable performance, convenient and practical. Two. Geosynthetics impermeability technical parameters: 1 Accuracy 0.5% 2 perforated plate through hole ф3mm 3. diameter ф200mm 4. maximum water pressure 2.5MPa 5. sample size ф200mm, the effective cross-sectional area ≥200 square cm 6. Automatic water pressure pumps, voltage 380v 7. pressure adjustment range: 0 ~ 2.5MPa 8. Dimensions: 600X750X1200 9. Total Weight: 150Kg three. Geosynthetics permeability meter installation and use of a .. Pressure setting: boot by setting key "return" press the shift key ">" and then adjust the key "+" and "-" and then adjust the value, adjusted , press the set button "back" deposit. After further adjustment finished lower limit value, press the Set button to exit. 8 hours time limit increased to 0.1MPa clear: to re-do the experiment, continuous press the "-" key is not released, the first display time value, 10 seconds after the start time from 0 hours, work can not be mistakenly press "!." 2 Time Check: Press the "-" key pressure into hour display, the upper limit for the minute, the lower limit for the second. 30 seconds after the back pressure display, 3 zero adjustment: boot in the absence of pressure, if not back to zero, press once and be set to zero. When there is pressure not to press the zero key, put pressure and then set to zero. 4 open water cover, add pure water. To fill up the tank. Started pressing, open valve, so that the water flows into the high-pressure storage chassis to just overflow. 5 The sample placed online without wrinkles within the catchment, the overflow of excess water to ensure that no air bubbles inside the gripper; porous plate cover evenly clamped specimen. Note: For the composite membranes from the textile material sample, such that the side facing the membrane surface; both surfaces of the textile material in the middle of the composite film, the surface facing the side of the sample can be clamped annular edge Carefully textile materials, parts stripped, glass, plastic, etc. can also be coated with an adhesive in the appropriate section to ensure that watertight holding section. 1 slowly adjust the inlet valve, so that hydraulic gripper rises to 0.1MPa, if they can estimate the approximate range of sample hydrostatic pressure can also be added directly to the water pressure began testing the lower limit of the range. Holding the pressure of at least 1h, the pores of the porous plate to observe whether there is water leakage. If the sample is not water seepage, with each progressively 0.1MPa of differential pressure, each level are maintained for at least 1h, until there is water leaking, it indicates that the sample has a seepage hole or rupture, recorded before a pressure is the Hydrostatic value of the sample to the nearest 0.1MPa. 2 If you use the device GB / T19979.2 stipulated, places to determine whether seepage seepage flow. Under certain hydraulic pressure and seepage flow may be that there is no seepage very hour, indicating the rapid increase in the sample when the seepage flow seepage holes or damage has occurred, the test can be terminated. Note: When testing of geosynthetics permeability meter hole appeared porous plate drops, as it will no longer have to wipe the water after leaking, you can determine which is the edge of the sample caused by the overflow may continue to test ; if it is still water leaking after wiping, you can determine the cause is due to water seepage samples, the test can be terminated. If only to determine whether the sample reaches a predetermined value hydrostatic pressure, this pressure may direct pressure for at least 1h, if there is no water leaking, it is determined that it meets the requirements. The remaining sample was measured according to the procedures hydrostatic pressure value. If three values ??are quite different (lower two values ??differ by more than 50%), increase the test specimen. 8, the minimum value or three values ??of the sample measured in the hydrostatic pressure as the hydrostatic pressure of the sample values; if the measured value more than 3, with the lowest average value of the two terms' where only one value times lower than the low value and less than 50%, the value should be discarded. 9, the test results calculated in accordance with relevant standards. Fourth, the experiment is completed, open geosynthetics permeability meter high pressure release valve positions, cleaning instruments indicated that the positions often try gland, high pressure storage chassis, perforated plate and coated with anti-rust oil wipe, such as device unused for long periods can Open the drain valve at the bottom right host, all the water will be released within the system, to prevent cracking