How to install a geosynthetics permeability coefficient tester?
Installation and use of geosynthetics permeability coefficient tester:
1.
Pressure setting: press the pressure setting button after power on
:
Press the adjustment keys “Add†and “Subtract†again to adjust the pressure value. After adjusting, press the Enter key to save. After adjusting the lower limit value, press the enter key to exit. Press the time setting again, adjust the addition and subtraction keys to adjust the time, adjust the zero point, and start the test.
2
Open the water injection cover and add pure water until the water tank is full. Start the pressurization and open the pressure regulating valve to allow water to flow into the high pressure chamber chassis to just overflow.
3
Place the sample without wrinkles on the net in the water collector, overflow excess water to ensure no air bubbles in the clamp; cover the porous plate and evenly clamp the sample.
Note: For specimens composited from textile materials and membranes, one side of the membrane should be facing the water surface; for composite materials with textile surfaces on both sides and the membrane in the middle, the specimen can be clamped to the side of the water surface. Part of the textile material is carefully peeled off, and a corresponding adhesive such as glass glue may be applied to the corresponding portion to ensure that the portion to be gripped does not leak water.
4
And the inlet valve raises the water pressure in the clamp to
0.1MPa
If the approximate range of hydrostatic pressure resistance of the sample can be estimated, the water pressure can be directly added to the lower limit of the range to start the test. Keep the above pressure at least
1h
Observe whether there is water seepage in the pores of the perforated plate. If the sample is not seeping water, per
0.1MPa
The step is pressurized step by step, and each level is kept at least
1h
When there is water seepage, it indicates that the sample has water seepage holes or cracks have occurred. The pressure before the recording is the hydrostatic pressure resistance value of the sample, accurate to
0.1MPa
.
5
,use
GB/T19979.2
In the device specified in the above, the water seepage flow is used to determine whether water seeps. When the percolation flow rate is very small under a certain hydraulic pressure difference, it can be considered that there is no water seepage. When the seepage flow increases rapidly, it indicates that the sample has water seepage holes or damage has occurred, and the test can be terminated.
Note: When there is water droplet in the hole of the perforated plate, if there is no water seeping after wiping it off, it can be judged that this is caused by the overflow of the edge of the sample, and the test can be continued; if it is wiped off, there is still If the water seeps out, it can be judged that it is caused by water seepage of the sample, and the test can be terminated. If it is only necessary to judge whether the sample reaches a certain hydrostatic pressure value, it can be directly pressurized to this pressure value and kept at least
1h
If there is no water seepage, it is judged to meet the requirements. The residual hydrostatic pressure values ​​of the remaining samples were determined according to the procedure. in case
3
Large difference in values
(
lower
2
Values ​​differ by more than
50%
), the test sample should be added.
6
,the above
3
The lowest value of the measured hydrostatic pressure values ​​is taken as the hydrostatic pressure resistance value of the sample; if the measured value exceeds
3
The lowest
2
The average value of the values ​​'if only
1
Lower value and lower than lower value
50%
Above, the value should be discarded.
7
The test results are calculated according to relevant standards.
pay attention:
After the experiment is completed, open the high pressure warehouse drain valve. The cleaning instrument indicates that the test chamber is covered, the high pressure chamber chassis, the perforated plate is dried and coated with anti-rust grease. If the equipment is not used for a long time, the drain valve at the lower right of the main unit can be opened. The water inside the system is completely released to prevent frost cracking.
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